Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 31.2	$ 15.4
Liabilities:
Interest rate swaps	43.1	21.9
Contingent consideration	3.1	9.0
Redeemable noncontrolling interests	578.0	0.0
Level 1
Assets:
Cash and cash equivalents	31.2	15.4
Liabilities:
Interest rate swaps	0.0	0.0
Contingent consideration	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Level 2
Assets:
Cash and cash equivalents	0.0	0.0
Liabilities:
Interest rate swaps	43.1	21.9
Contingent consideration	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Level 3
Assets:
Cash and cash equivalents	0.0	0.0
Liabilities:
Interest rate swaps	0.0	0.0
Contingent consideration	3.1	9.0
Redeemable noncontrolling interests	$ 578.0	$ 0.0