Consolidated Statements of Changes in Equity (USD $) In Millions	Total	EBT	Share Buy-back Program	Common stock	Additional paid-in capital	Treasury stock	Treasury stock EBT	Treasury stock Share Buy-back Program	Accumulated other comprehensive income	Retained earnings/(accumulated deficit)
As at Dec. 31, 2012	$ 3,809.2			$ 55.7	$ 2,981.5	$ (310.4)			$ 86.9	$ 995.5
Shares as at Dec. 31, 2012	562.5			562.5
Net income	64.8									64.8
Foreign currency translation	(36.1)								(36.1)
Options exercised	0				0
Option exercised (in shares)	0.3
Share-based compensation	16.6				16.6
Tax benefit associated with exercise of stock options	4.0				4.0
Shares repurchased		0	(75.0)				0	(75.0)
Shares released by EBT to satisfy exercise of stock options	0.3						43.8			(43.5)
Unrealized holding gain (loss) on available-for-sale securities, net of taxes	(1.7)								(1.7)
As at Mar. 31, 2013	$ 3,782.1			$ 55.7	$ 3,002.1	$ (341.6)			$ 49.1	$ 1,016.8
Shares as at Mar. 31, 2013	562.8