Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Redeemable Noncontrolling Interest [Abstract]
Balance at January 1	$ 20.9	$ 130.4	$ 130.4
Other comprehensive income	0.0	(1.7)
Redemption value adjustment	(0.3)	(18.6)
Redemption of shares	0.0	(10.3)
Balance at March 31	$ 20.6	$ 99.8	$ 20.9