Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Net, Current [Abstract]
Trade				$ 555.7	$ 605.7
Other				53.9	47.8
Total accounts receivable				609.6	653.5
Allowance for doubtful accounts	$ (11.2)	$ (8.3)	$ (9.1)	(10.1)	(11.2)
Accounts receivable, net				$ 599.5	$ 642.3
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of year	11.2	8.3	9.1
Provision for uncollectible accounts receivable	1.4	5.0	2.8
Write offs less recoveries	(0.9)	(1.0)	(3.0)
Foreign currency exchange effects	(1.6)	(1.1)	(0.6)
End of year	$ 10.1	$ 11.2	$ 8.3