Consolidated Statements of Changes in Equity (USD $) In Millions	Total	Common stock	Additional paid-in capital	Treasury stock	Accumulated other comprehensive income	Retained earnings
As at Dec. 31, 2013	$ 5,366.0	$ 58.6	$ 4,186.3	$ (450.6)	$ 110.2	$ 1,461.5
Shares as at Dec. 31, 2013	597.5	597.5
Net income	230.4					230.4
Other comprehensive income, net of tax	2.6				2.6
Options exercised	0		0
Option exercised (in shares)		0.4
Share-based compensation	26.2		26.2
Tax benefit associated with exercise of stock options (in US dollar)	20.5		20.5
Shares released by EBT to satisfy exercise of stock options	0.1			68.9		(68.8)
As at Mar. 31, 2014	$ 5,645.8	$ 58.6	$ 4,233.0	$ (381.7)	$ 112.8	$ 1,623.1
Shares as at Mar. 31, 2014	597.9	597.9