Revenue - Accounts Receivable, Allowance for Credit Loss (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation and qualifying accounts [Roll forward]
Balance at beginning of period	$ 9.8	$ 7.8	$ 7.9
Provision within facility operating expense	21.6	16.7	15.2
Write-offs	(19.2)	(16.2)	(19.5)
Recoveries and other	1.1	1.5	4.2
Balance at end of period	$ 13.3	$ 9.8	$ 7.8