Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 40.2	$ 42.5	$ 42.7
Charges to costs and expenses	50.5	10.1	6.5
Acquisitions/(dispositions)	8.6	(0.3)	2.2
Uncollectible accounts written off	(11.2)	(11.9)	(7.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	0.2
Foreign currency translation adjustment	1.0	(0.2)	(1.8)
Balance at end of period	$ 98.3	$ 40.2	$ 42.5
New Accounting Pronouncement or Change in Accounting Principle, Description	9.0