CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
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	(126.8)			(127.5)		0.7
Currency translation adjustment	(22.8)				(23.0)	0.2
Cumulative currency translation loss realized through disposition of Argentina operations	0.0
Change in qualifying cash flow hedge, net of tax expense	0.6				0.6
Accelerated amortization of cash flow hedge, net of tax	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	(59.0)			(59.2)		0.2
Currency translation adjustment	(28.9)				(28.8)	(0.1)
Cumulative currency translation loss realized through disposition of Argentina operations	0.0
Change in qualifying cash flow hedge, net of tax expense	0.0
Accelerated amortization of cash flow hedge, net of tax	0.0
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net	0.0
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
Beginning Balance at Dec. 31, 2019	2,334.7	$ 0.9	1,205.7	1,442.4	(318.1)	3.8
Beginning Balance (in shares) at Dec. 31, 2019		91.2
Net loss	(104.9)			(105.8)		0.9
Currency translation adjustment	1.5				1.3	0.2
Cumulative currency translation loss realized through disposition of Argentina operations	87.2				87.2
Accelerated amortization of cash flow hedge, net of tax	0.0
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net	2.2		2.2
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net (in shares)		0.3
Stock compensation expense	20.3		20.3
Cumulative effect of adopting ASU 2016-13 | ASU 2016-13	(2.5)			2.5
Ending Balance at Sep. 30, 2020	2,338.5	$ 0.9	1,228.2	1,334.1	(229.6)	4.9
Ending Balance (in shares) at Sep. 30, 2020		91.5
Beginning Balance at Jun. 30, 2020	2,296.1	$ 0.9	1,222.4	1,415.3	(347.0)	4.5
Beginning Balance (in shares) at Jun. 30, 2020		91.5
Net loss	(80.9)			(81.2)		0.3
Currency translation adjustment	30.3				30.2	0.1
Cumulative currency translation loss realized through disposition of Argentina operations	87.2				87.2
Accelerated amortization of cash flow hedge, net of tax	0.0
Issuance of common stock for exercise of options, RSU vesting, and employee stock purchases, net	(1.6)		(1.6)
Stock compensation expense	7.4		7.4
Ending Balance at Sep. 30, 2020	$ 2,338.5	$ 0.9	$ 1,228.2	$ 1,334.1	$ (229.6)	$ 4.9
Ending Balance (in shares) at Sep. 30, 2020		91.5