CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 75.7	$ 92.9	$ (319.9)
Foreign currency translation:
Other comprehensive income (loss) before reclassifications, net of tax benefit of $15.7 for 2020	107.4	70.5	(378.0)
Reclassifications	0.0	479.8	0.0
Total foreign currency translation adjustments	107.4	550.3	(378.0)
Pension and post-retirement plans:
Other comprehensive income before reclassifications, net of tax expense (benefit) of $1.1, $(0.9) and $(1.6) for 2020, 2019 and 2018, respectively	4.4	0.6	1.8
Reclassifications, net of tax expense of $0.0 for 2019	0.0	(2.1)	0.0
Total pension and post-retirement plans	4.4	(1.5)	1.8
Derivative financial instruments:
Other comprehensive (loss) income before reclassifications, net of tax expense of $1.6 and $1.5 for 2020 and 2018, respectively	(40.2)	(29.2)	6.0
Reclassifications, net of tax expense of $1.5 for 2019	14.1	(3.0)	(0.5)
Total unrealized (loss) gain arising on qualified hedging derivatives	(26.1)	(32.2)	5.5
Other comprehensive income (loss)	85.7	516.6	(370.7)
Comprehensive income (loss)	161.4	609.5	(690.6)
Comprehensive (income) loss attributable to the non-controlling interests	0.0	(40.9)	30.0
Comprehensive income (loss) attributable to stockholders	$ 161.4	$ 568.6	$ (660.6)