Consolidated Statements of Stockholders' Equity (USD $) In Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Comprehensive Loss
Balance, Beginning Value, Shares at Dec. 31, 2012		150.4	(11.9)
Balance, Beginning Value at Dec. 31, 2012	$ 1,033.8	$ 150.4	$ (252.9)	$ 533.6	$ 710.6	$ (107.9)
Net income (loss)	65.3				65.3
Issuance of shares for employee stock plans and stock based compensation	0.1		31.8	(31.7)
Taxes paid related to net share settlement of equity awards			(0.6)
Taxes paid related to net share settlement of equity awards	(11.8)		(11.8)
Issuance of shares for employee stock plans and stock-based compensation			1.5
Compensation expense associated with stock awards	1.9			1.9
Other comprehensive income	3.6					3.6
Balance, Ending Value, Shares at Mar. 31, 2013		150.4	(11.0)
Balance, Ending Value at Mar. 31, 2013	$ 1,092.9	$ 150.4	$ (232.9)	$ 503.8	$ 775.9	$ (104.3)