CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Millions, $ in Millions	Total	Mexico Operations	Chile Operations	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Mexico Operations	Accumulated Other Comprehensive Loss Chile Operations	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 2,816.4				$ 0.8	$ 1,166.5	$ 2,006.1	$ (367.6)			$ 10.6
Beginning Balance (in shares) at Dec. 31, 2016				0.7	85.2
Net income (loss)	43.0						42.4				0.6
Currency translation adjustment	80.5							79.3			1.2
Change in qualifying cash flow hedge, net of tax	1.3							1.3
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net	17.3				$ 0.1	17.2
Issuance of common stock for exercise of options, PSU and RSU vesting and employee stock purchases, net (in shares)					0.3
Repurchase and cancellation of convertible preferred stock	(34.2)					(51.5)	17.3
Preferred stock dividend	(36.3)						(36.3)
Stock compensation expense	21.3					21.3
Reduction to noncontrolling interests due to additional ownership	(0.7)					(0.3)					(0.4)
Ending Balance at Dec. 31, 2017	2,908.6				$ 0.9	1,153.2	2,029.5	(287.0)			12.0
Ending Balance (in shares) at Dec. 31, 2017				0.7	85.5
Cumulative effect of new accounting standard	13.0						13.0
Net income (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
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, (in shares)				(0.6)	4.7
Preferred stock dividend	(25.5)						(25.5)
Stock compensation expense	24.1					24.1
Payments/Changes to noncontrolling interest	(0.4)										(0.4)
Ending Balance at Dec. 31, 2018	2,597.1				$ 0.9	1,162.6	1,789.2	(365.3)			9.7
Ending Balance (in shares) at Dec. 31, 2018					90.7
Net income (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
Payments/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