Revenue - Allowance For Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 53.5	$ 36.5	$ 45.9
Bad debt expense	33.8	56.8	53.1
Uncollectible accounts written off, net of recoveries	(38.4)	(42.8)	(62.5)
Ending balance	$ 48.9	53.5	$ 36.5	$ 45.9
Accounting standards update [Extensible List]			Accounting Standards Update 2016-13 [Member]	ASU 2018-02
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 3.0
Ending balance			$ 3.0