CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Millions, $ in Millions	Total	Restatement adjustment	Mexico Operations	Chile Operations	Argentina Operations	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Restatement adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Mexico Operations	Accumulated Other Comprehensive Loss Chile Operations	Accumulated Other Comprehensive Loss Argentina Operations	Noncontrolling Interests
Cumulative effect of new accounting standard	$ 13.0								$ 13.0
Beginning Balance at Dec. 31, 2017	2,908.6					$ 0.0	$ 0.9	$ 1,153.2	2,029.5		$ (287.0)				$ 12.0
Beginning Balance (in shares) at Dec. 31, 2017						0.7	85.5
Net loss	(245.6)								(244.7)						(0.9)
Currency translation adjustment	(80.3)										(79.3)				(1.0)
Change in qualifying cash flow hedge, net of tax	1.0										1.0
Accelerated amortization of interest rate lock premiums, net of tax	0.0
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net	19.4							19.4
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net (in shares)							0.5
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	0.0
Conversion of convertible preferred stock to common stock, (in shares)						(0.6)	4.7
Preferred stock dividend	(25.5)								(25.5)
Stock compensation expense	24.1							24.1
Changes to noncontrolling interest	(0.4)														(0.4)
Ending Balance at Dec. 31, 2018	2,597.1					$ 0.0	$ 0.9	1,162.6	1,789.2		(365.3)				9.7
Ending Balance (in shares) at Dec. 31, 2018						0.0	90.7
Net loss	(346.0)								(346.8)						0.8
Currency translation adjustment	8.8										8.5				0.3
Change in qualifying cash flow hedge, net of tax	0.7										0.7
Accelerated amortization of interest rate lock premiums, net of tax	2.3										2.3
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net	19.7							19.7
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net (in shares)							0.5
Cumulative currency translation loss realized through disposition			$ 18.9	$ 16.8								$ 18.9	$ 16.8
Stock compensation expense	17.1							17.1
Changes to noncontrolling interest	(0.7)							6.3							(7.0)
Ending Balance at Dec. 31, 2019	2,334.7						$ 0.9	1,205.7	1,442.4		(318.1)				3.8
Ending Balance (in shares) at Dec. 31, 2019							91.2
Net loss	(55.9)								(57.3)						1.4
Currency translation adjustment	44.0										43.5				0.5
Accelerated amortization of interest rate lock premiums, net of tax	0.0
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net	2.8							2.8
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net (in shares)							0.4
Cumulative currency translation loss realized through disposition					$ 87.2									$ 87.2
Stock compensation expense	25.5							25.5
Change in accounting principle | Accounting Standards Update 2016-13		$ (2.5)								$ (2.5)
Changes to noncontrolling interest	(1.4)														(1.4)
Ending Balance at Dec. 31, 2020	$ 2,434.4						$ 0.9	$ 1,234.0	$ 1,382.6		$ (187.4)				$ 4.3
Ending Balance (in shares) at Dec. 31, 2020							91.6