Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
EPS numerator:
(Loss) income from continuing operations, net of income taxes	$ (129.3)	$ 133.3
Less: Net (loss) income attributable to noncontrolling interests	(1.8)	5.7
(Loss) income from continuing operations attributable to common stockholders	(127.5)	127.6
Loss from discontinued operations, net of income taxes	(2.2)	(3.4)
Net (loss) income attributable to common stockholders	$ (129.7)	$ 124.2
EPS denominator:
Weighted average shares outstanding — basic	97.2	108.5
Impact of dilutive securities	0.0	2.0
Weighted average shares outstanding — diluted	97.2	110.5
Basic EPS attributable to common stockholders:
(Loss) income from continuing operations	$ (1.31)	$ 1.18
Loss from discontinued operations	(0.02)	(0.04)
Net (loss) income attributable to common stockholders	(1.33)	1.14
Diluted EPS attributable to common stockholders:
(Loss) income from continuing operations	(1.31)	1.15
Loss from discontinued operations	(0.02)	(0.03)
Net (loss) income attributable to common stockholders	$ (1.33)	$ 1.12
Earnings per share textuals
Antidilutive shares excluded from EPS calculation	3.0	0.3