CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Balances at Dec. 31, 2012	$ 1,401.9	$ 1,017.9	$ 233.8	$ 92.3	$ 57.9
Balances (in shares) at Dec. 31, 2012	168,726,984	168,727
Increase (Decrease) in Shareholders' Equity
Amortization of stock-based compensation	1.4	0	1.4
Stock option exercises (in shares)	0	293
Stock option exercises	0.4	1.9	(1.5)
Settlement of prepaid common stock purchase contracts (in shares)		1,651
Settlement of prepaid common stock purchase contracts	0	6.0	(6.0)
Comprehensive loss:
Net income	0.9			0.9	0
Foreign currency translation	(26.1)			0	(26.1)
Total comprehensive (loss) income	(25.2)
Balances at Mar. 31, 2013	$ 1,378.5	$ 1,025.8	$ 227.7	$ 93.2	$ 31.8
Balances (in shares) at Mar. 31, 2013	170,671,457	170,671