11. capital assets

(a) Capital assets, net

Included in capital expenditures for the year ended December 31, 2004, were additions of intangible assets subject to amortization of $227.8 million (2003 – $213.0 million) and intangible assets with indefinite lives of $1.2 million (2003 – $1.5 million).

The Company's estimate of 2005 expenditures for capital assets is approximately $1,300 million to $1,400 million. Purchase commitments have been made in connection with a portion of these capital assets as at December 31, 2004. In January 2005, the Company acquired, at auction, spectrum licences for $8.8 million.

(b) Intangible assets subject to amortization

Estimated aggregate amortization expense for intangible assets subject to amortization, calculated upon such assets held as at December 31, 2004, for each of the next five fiscal years is as follows:

(c) Intangible assets with indefinite lives

As referred to in Note 1(b) and Note 1(f), the carrying value of intangible assets with indefinite lives and goodwill are periodically tested for impairment and this test represents a significant estimate for the Company. There is a material degree of uncertainty with respect to this estimate given the necessity of making key economic assumptions about the future. The Company considers a range of reasonably possible amounts and decides upon an amount that represents management's best estimate. If the future was to adversely differ from management's best estimate of key economic assumptions and associated cash flows were to be materially adversely affected, the Company could potentially experience future material impairment charges in respect of its intangible assets with indefinite lives and goodwill.

Consistent with current industry-specific valuation methods, the Company uses a discounted cash flow model combined with a market-based approach as a part of determining the fair value of its spectrum licences and goodwill. The discounted cash flow methodology uses management's best estimate of the cash flows and a discount rate established by calculating a weighted average cost of capital for each reporting unit. The market comparable approach uses current (at the time of test) market consensus estimates and equity trading prices for U.S. and Canadian firms in the same industry. In addition, the Company ensures that the combination of the valuations of the reporting units is reasonable based on current market values of the Company.

Based upon sensitivity testing conducted as a part of the December 2004 annual test, and the results of operations for 2004, the Company estimates that its annual cash flows would be sufficient to recover its carrying value of its intangible assets with indefinite lives and goodwill. A component of the sensitivity testing was a break-even analysis; an assumption of no growth rate, with all other assumptions being held constant, resulted in the Company continuing to be able to recover its carrying value of intangible assets with indefinite lives and goodwill for the foreseeable future. Stress testing included moderate declines in annual cash flows with all other assumptions being held constant; this too resulted in the Company continuing to be able to recover its carrying value of intangible assets with indefinite lives and goodwill for the foreseeable future.