CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 82.3	$ 8.6
Foreign currency translation:
Other comprehensive loss before reclassifications, net of tax expense of $5.9 and $0.0 for three months ended March 31, 2021 and 2020, respectively	(52.7)	(23.6)
Reclassifications	0.0	0.0
Total foreign currency translation adjustments	(52.7)	(23.6)
Pension and post-retirement plans:
Other comprehensive loss before reclassifications, net of tax expense of $0.0 and $0.5 for the three months ended March 31, 2021 and 2020, respectively	0.0	(0.5)
Reclassifications, net of tax expense of $0.0 for the three months ended March 31, 2021 and 2020, respectively	0.0	0.0
Total pension and post-retirement plans	0.0	(0.5)
Derivative financial instruments:
Other comprehensive income (loss) before reclassifications, net of tax expense of $1.8 and $0.0 for the three months ended March 31, 2021 and 2020, respectively	3.0	(32.0)
Reclassifications, net of tax expense of $0.0 for the three months ended March 31, 2021 and 2020, respectively	4.4	1.6
Total unrealized loss arising on qualified hedging derivatives	7.4	(30.4)
Other comprehensive loss	(45.3)	(54.5)
Comprehensive income (loss) attributable to common stockholders	$ 37.0	$ (45.9)