Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - 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 year	$ 6.3	$ 5.9	$ 6.7
Additions charged to cost and expenses	4.5	4.8	3.9
Write-offs	(4.9)	(3.7)	(5.6)
Recoveries	1.6	0.6	0.9
Other	(1.4)	(1.3)	0.0
Balance at end of year	$ 6.1	$ 6.3	$ 5.9