Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Trade Accounts Receivable [Roll Forward]
Balance at beginning of the period		$ 18.7	$ 18.7	$ 19.3
Provision charged to expense		1.8	3.5	2.7
Write-offs, net of recoveries		(2.2)	(4.8)	(2.4)
Charged to other accounts	[1]	(0.9)	1.3	(0.9)
Balance at end of the period		$ 17.4	$ 18.7	$ 18.7

[1] Primarily includes the effect of foreign currency translation adjustments for the Company's subsidiaries with functional currencies other than the USD.