Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 42.5	$ 42.7	$ 55.7
Charges to costs and expenses	10.1	6.5	9.5
Acquisitions/(dispositions)	(0.3)	2.2	(1.0)
Uncollectible accounts written off	(11.9)	(7.1)	(25.5)
Foreign currency translation adjustment	(0.2)	(1.8)	4.0
Balance at end of period	$ 40.2	$ 42.5	$ 42.7