Consolidated Statements of Changes in Equity (USD $) In Millions	Total	Common stock	Additional paid-in capital	Treasury stock	Accumulated other comprehensive income	Retained earnings/(accumulated deficit)
As at Dec. 31, 2011	$ 3,185.0	$ 55.7	$ 2,853.3	$ (287.2)	$ 60.3	$ 502.9
Shares as at Dec. 31, 2011	562.5	562.5
Net income	238.4					238.4
Foreign currency translation	36.6				36.6
Options exercised	0.1		0.1
Options exercised, shares		0
Share-based compensation	22.0		22.0
Tax benefit associated with exercise of stock options	34.8		34.8
Shares released by Employee Benefit Trust ("EBT") to satisfy exercise of stock options	0.8			127.4		(126.6)
Unrealized holding gain on available-for-sale securities, net of taxes	2.9				2.9
Other than temporary impairment of available-for-sale securities (net of taxes of $nil in all periods)	0
As at Mar. 31, 2012	$ 3,520.6	$ 55.7	$ 2,910.2	$ (159.8)	$ 99.8	$ 614.7
Shares as at Mar. 31, 2012	562.5	562.5