CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance at Dec. 31, 2017	$ 2,908.6		$ 0.9	$ 1,153.2	$ 2,029.5	$ (287.0)	$ 12.0
Beginning Balance (in shares) at Dec. 31, 2017		0.7	85.5
Cumulative effect of new accounting standard, net of tax	13.0				13.0
Net (loss) income	73.6				73.7		(0.1)
Currency translation adjustment	(56.9)					(56.3)	(0.6)
Change in qualifying cash flow hedge, net of tax expense	0.8					0.8
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net	16.9			16.9
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net (in shares)			0.4
Repurchase and cancellation of convertible preferred stock	(17.2)			(34.1)	16.9
Repurchase and cancellation of convertible preferred stock (in shares)		(0.1)
Conversion of convertible preferred stock to common stock, (in shares)		(0.6)	4.7
Preferred stock dividend	(25.5)				(25.5)
Stock compensation expense	19.5			19.5
Payment to noncontrolling interest	(0.2)						(0.2)
Ending Balance at Sep. 30, 2018	2,932.6		$ 0.9	1,155.5	2,107.6	(342.5)	11.1
Ending Balance (in shares) at Sep. 30, 2018			90.6
Beginning Balance at Jun. 30, 2018	2,901.6		$ 0.9	1,145.1	2,090.1	(345.8)	11.3
Beginning Balance (in shares) at Jun. 30, 2018		0.6	85.7
Net (loss) income	23.5				23.5
Currency translation adjustment	3.0					3.0
Change in qualifying cash flow hedge, net of tax expense	0.3					0.3
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net	8.5			8.5
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net (in shares)			0.2
Repurchase and cancellation of convertible preferred stock	(2.4)			(4.8)	2.4
Conversion of convertible preferred stock to common stock, (in shares)		(0.6)	4.7
Preferred stock dividend	(8.4)				(8.4)
Stock compensation expense	6.7			6.7
Payment to noncontrolling interest	(0.2)						(0.2)
Ending Balance at Sep. 30, 2018	2,932.6		$ 0.9	1,155.5	2,107.6	(342.5)	11.1
Ending Balance (in shares) at Sep. 30, 2018			90.6
Beginning Balance at Dec. 31, 2018	2,597.1		$ 0.9	1,162.6	1,789.2	(365.3)	9.7
Beginning Balance (in shares) at Dec. 31, 2018			90.7
Net (loss) income	(126.8)				(127.5)		0.7
Currency translation adjustment	(22.8)					(23.0)	0.2
Change in qualifying cash flow hedge, net of tax expense	0.6					0.6
Accelerated amortization of cash flow hedge, net of tax expense	2.3					2.3
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net	13.9			13.9
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net (in shares)			0.4
Stock compensation expense	13.7			13.7
Payment to noncontrolling interest	(0.7)			6.3			(7.0)
Ending Balance at Sep. 30, 2019	2,477.3		$ 0.9	1,196.5	1,661.7	(385.4)	3.6
Ending Balance (in shares) at Sep. 30, 2019			91.1
Beginning Balance at Jun. 30, 2019	2,562.2		$ 0.9	1,192.8	1,720.9	(356.6)	4.2
Beginning Balance (in shares) at Jun. 30, 2019			91.1
Net (loss) income	(59.0)				(59.2)		0.2
Currency translation adjustment	(28.9)					(28.8)	(0.1)
Stock compensation expense	3.7			3.7
Payment to noncontrolling interest	(0.7)						(0.7)
Ending Balance at Sep. 30, 2019	$ 2,477.3		$ 0.9	$ 1,196.5	$ 1,661.7	$ (385.4)	$ 3.6
Ending Balance (in shares) at Sep. 30, 2019			91.1