Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive Loss [Member]
Balance, Beginning at Dec. 31, 2013	$ 1,226.3	$ 152.0	$ (232.2)	$ 508.0	$ 887.7	$ (89.2)
Balance, Beginning, Shares at Dec. 31, 2013		152.0	10.9
Net income (loss)	(75.4)				(75.4)
Issuance for employee stock plans and stock-based compensation	(0.7)		$ (8.8)	(9.5)
Issuance of shares for employee stock plans and stock-based compensation			(0.4)
Amortization of restricted stock grants	2.1			2.1
Exercise of stock warrants, shares		0.8
Exercise of stock warrants	0.0	$ 0.8		(0.8)
Compensation expense associated with stock awards	7.2			7.2
Shares Paid for Tax Withholding for Share Based Compensation			0.1
Payments Related to Tax Withholding for Share-based Compensation	(1.5)		$ (1.6)
Tax benefit of employee stock plan transactions	(1.6)
Other comprehensive loss	(42.1)					(42.1)
Balance, Ending, Shares at Dec. 31, 2014		152.8	10.6
Balance, Ending at Dec. 31, 2014	1,115.8	$ 152.8	$ (225.0)	507.0	812.3	(131.3)
Net income (loss)	(88.1)				(88.1)
Issuance for employee stock plans and stock-based compensation	(0.9)		$ (20.5)	(19.6)
Issuance of shares for employee stock plans and stock-based compensation			(1.0)
Amortization of restricted stock grants	1.8			1.8
Exercise of stock warrants, shares		0.2
Exercise of stock warrants	0.0	$ 0.2		(0.2)
Compensation expense associated with stock awards	7.5			7.5
Shares Paid for Tax Withholding for Share Based Compensation			0.4
Payments Related to Tax Withholding for Share-based Compensation	(6.1)		$ (6.1)
Tax benefit of employee stock plan transactions	(6.1)
Other comprehensive loss	(14.8)					(14.8)
Balance, Ending, Shares at Dec. 31, 2015		153.0	10.0
Balance, Ending at Dec. 31, 2015	1,017.0	$ 153.0	$ (210.6)	496.5	724.2	(146.1)
Net income (loss)	149.8				149.8
Issuance for employee stock plans and stock-based compensation	(0.4)		$ (30.8)	(30.4)
Issuance of shares for employee stock plans and stock-based compensation			(1.5)
Amortization of restricted stock grants	2.4			2.4
Exercise of stock warrants, shares		0.4
Exercise of stock warrants	0.0	$ 0.4		(0.4)
Compensation expense associated with stock awards	10.5			10.5
Shares Paid for Tax Withholding for Share Based Compensation			0.5
Payments Related to Tax Withholding for Share-based Compensation	(9.2)		$ (9.2)
Tax benefit of employee stock plan transactions	(9.2)
Other comprehensive loss	8.9					8.9
Balance, Ending, Shares at Dec. 31, 2016		153.4	9.0
Balance, Ending at Dec. 31, 2016	1,195.7	$ 153.4	$ (189.0)	478.2	890.3	$ (137.2)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 15.9			$ (0.4)	$ 16.3