Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Provision	$ 4.1	$ 5.1	$ 8.1
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	20.2	23.0	32.0
Impact of foreign currency exchange rate changes	0.8	(0.1)	(4.2)
Provision	4.1	5.1	8.1
Write-offs	(1.1)	(4.4)	(3.1)
Other	(4.8)	(3.4)	(9.8)
Ending balance	19.2	20.2	23.0
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	177.1	172.1	145.4
Provision	13.7	27.9	45.8
Changes attributable to acquisitions and dispositions	(38.9)	(20.5)	6.3
Changes impacting equity and other movements	18.9	0.9	(18.6)
Write-offs	(13.4)	(3.3)	(6.8)
Ending balance	$ 157.4	$ 177.1	$ 172.1