Other Current Liabilities - Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Right-of-use operating lease liabilities	$ 38.3	$ 37.3
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Accrued legal settlement	$ 32.3	$ 35.1
Interest payable	31.8	21.8
Amounts due to patients and payors	20.4	16.5
Accrued expenses and other	110.1	80.5
Total	$ 232.9	$ 191.2