Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable, Net, Current [Abstract]
Trade				$ 605.7	$ 485.9
Other				47.8	23.5
Total accounts receivable				653.5	509.4
Allowance for doubtful accounts	$ (8.3)	$ (9.1)	$ (10.0)	(11.2)	(8.3)
Accounts receivable, net				$ 642.3	$ 501.1
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of year	8.3	9.1	10.0
Write offs less recoveries	(1.0)	(3.0)	(0.9)
Foreign currency exchange effects	(1.1)	(0.6)	(2.7)
End of year	11.2	8.3	9.1
Continuing operations
Movement in Valuation Allowances and Reserves [Roll Forward]
Provision for uncollectible accounts receivable:	5.0	2.8	2.9
Discontinued operations
Movement in Valuation Allowances and Reserves [Roll Forward]
Provision for uncollectible accounts receivable:	$ 0.0	$ 0.0	$ (0.2)