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)
Proceeds from Warrant Exercises		0.3
Adjustments to Additional Paid in Capital, Warrant Issued	0			(0.3)
Net income (loss)	159.4				159.4
Issuance of shares for employee stock plans and stock based compensation	0.1		32.6	(32.5)
Taxes paid related to net share settlement of equity awards	(12.0)
Stock Issued During Period, Shares, Conversion of Convertible Securities		0.3
Issuance of shares for employee stock plans and stock-based compensation			1.6
Compensation expense associated with stock awards	4.1			4.1
Other comprehensive income	(2.9)					(2.9)
Balance, Ending Value, Shares at Jun. 30, 2013		150.7	(10.9)
Balance, Ending Value at Jun. 30, 2013	1,182.5	150.7	(232.3)	504.9	870.0	(110.8)
Balance, Beginning Value at Mar. 31, 2013
Net income (loss)	94.1
Taxes paid related to net share settlement of equity awards			(0.6)
Taxes paid related to net share settlement of equity awards	(0.2)		(12.0)
Balance, Ending Value, Shares at Jun. 30, 2013			(10.9)
Balance, Ending Value at Jun. 30, 2013	$ 1,182.5		$ (232.3)