Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 89.7	$ 77.0	$ 74.3
Charged to costs & expenses	32.5	25.2	15.4
Impact of currency	(0.6)	(6.3)	(5.1)
Charged to other accounts	2.3	21.1	12.4
Write-offs, write-downs & deductions	(20.4)	(27.3)	(20.0)
Balance at end of period	$ 103.5	$ 89.7	$ 77.0