Schedule II (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 18.2	$ 18.0	$ 21.0
Additions charged to profit and loss	30.5	27.5	27.5
Write-offs	(31.2)	(28.1)	(28.3)
Foreign currency impact	0.2	0.1	(2.2)
Other	0.0	0.7	0.0
Balance at end of year	17.7	18.2	18.0
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	40.3	42.0	47.9
Additions charged to profit and loss	6.6	(1.1)	(3.8)
Write-offs	0.0	0.0	0.0
Foreign currency impact	1.6	(0.6)	(2.1)
Other	0.0	0.0	0.0
Balance at end of year	$ 48.5	$ 40.3	$ 42.0