Goodwill and Intangibles - Goodwill (Details) $ in Millions	9 Months Ended			12 Months Ended
	Sep. 30, 2018 USD ($) segment	Sep. 30, 2018 USD ($) item	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Gross Balance
Balance at the beginning of the period			$ 717.6	$ 699.8
Acquired During the Period			1.5	2.0
Foreign Currency Translation and Other			(4.4)	15.8
Balance at the end of the period			714.7	717.6
Accumulated Impairment Losses
Balance at the beginning of the period			(167.1)	(167.1)
Balance at the end of the period			(167.1)	(167.1)
Net Goodwill	$ 547.6	$ 547.6	547.6	550.5
Number of geographic segments	3	3
Americas
Gross Balance
Balance at the beginning of the period			437.4	434.7
Acquired During the Period			1.5	2.0
Foreign Currency Translation and Other			(0.4)	0.7
Balance at the end of the period			438.5	437.4
Accumulated Impairment Losses
Balance at the beginning of the period			(24.5)	(24.5)
Balance at the end of the period			(24.5)	(24.5)
Net Goodwill	$ 414.0	$ 414.0	414.0	412.9
Europe
Gross Balance
Balance at the beginning of the period			249.3	234.9
Foreign Currency Translation and Other			(3.0)	14.4
Balance at the end of the period			246.3	249.3
Accumulated Impairment Losses
Balance at the beginning of the period			(129.7)	(129.7)
Balance at the end of the period			(129.7)	(129.7)
Net Goodwill	116.6	116.6	116.6	119.6
APMEA
Gross Balance
Balance at the beginning of the period			30.9	30.2
Foreign Currency Translation and Other			(1.0)	0.7
Balance at the end of the period			29.9	30.9
Accumulated Impairment Losses
Balance at the beginning of the period			(12.9)	(12.9)
Balance at the end of the period			(12.9)	(12.9)
Net Goodwill	$ 17.0	$ 17.0	$ 17.0	$ 18.0