Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Comprehensive Loss
Balance, Beginning at Dec. 31, 2012	$ 1,033.8	$ 150.4	$ (252.9)	$ 533.6	$ 710.6	$ (107.9)
Balance, Beginning, Shares at Dec. 31, 2012		150.4	11.9
Net income (loss)	177.1				177.1
Issuance for employee stock plans and stock-based compensation	(12.0)			(32.7)
Issuance of shares for employee stock plans and stock-based compensation			(1.0)
Stock Issued During Period, Value, Stock Options Exercised			$ 20.7
Amortization of restricted stock grants	8.4			8.4
Exercise of stock warrants		$ 1.6
Exercise of stock warrants, shares		1.6
Exercise of stock warrants	0.0
Payments Related to Tax Withholding for Share-based Compensation	12.1
Issuance of shares for employee stock plans and stock-based compensation				(0.3)
Other comprehensive loss	18.7					18.7
Balance, Ending, Shares at Dec. 31, 2013		152.0	10.9
Balance, Ending at Dec. 31, 2013	1,226.3	$ 152.0	$ (232.2)	508.0	887.7	(89.2)
Net income (loss)	(75.4)				(75.4)
Issuance for employee stock plans and stock-based compensation	(0.7)			(9.5)
Issuance of shares for employee stock plans and stock-based compensation			(0.4)
Stock Issued During Period, Value, Stock Options Exercised			$ 8.8
Amortization of restricted stock grants	2.1			2.1
Exercise of stock warrants		$ 0.8
Exercise of stock warrants, shares		0.8
Exercise of stock warrants	0.0			(0.8)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition				$ 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)
Issuance of shares for employee stock plans and stock-based compensation	(1.6)
Tax cost of employee stock plan transactions	(13.9)
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		$ 0.2
Exercise of stock warrants, shares		0.2
Exercise of stock warrants	0.0			(0.2)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition				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)
Issuance of shares for employee stock plans and stock-based compensation	(6.1)			0.0
Tax cost of employee stock plan transactions	(16.9)
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)