Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair value assets and liabilities measured on nonrecurring basis
Long-term debt, fair value	$ 3,337.4	$ 3,996.1
Discount rate ceiling contingent acquisition obligations	4.00%
Level 1
Fair value assets and liabilities measured on nonrecurring basis
Long-term debt, fair value	$ 0.0	0.0
Level 2
Fair value assets and liabilities measured on nonrecurring basis
Long-term debt, fair value	3,295.6	3,951.1
Level 3
Fair value assets and liabilities measured on nonrecurring basis
Long-term debt, fair value	$ 41.8	$ 45.0