Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 31.7	$ 24.1	$ 31.7	$ 24.1
Intangible assets, net (including Goodwill), beginning balance	52.1	54.2	54.7	53.0
Add: Amounts held for sale at beginning of the period					$ 0.0	$ 0.0	$ 0.3	$ 0.4
Amortization, including foreign currency translation	2.6	3.0	5.2	5.8
Acquisitions of intangible assets				3.9
Goodwill, ending balance	31.7	24.1	31.7	24.1
Intangible assets, net (including Goodwill), ending balance	49.5	51.5	49.5	51.5
Other Intangible Assets
Goodwill [Roll Forward]
Other intangible assets, beginning balance	20.4	30.1	23.0	28.9
Add: Amounts held for sale at beginning of the period					$ 0.0	$ 0.0	$ 0.3	$ 0.4
Amortization, including foreign currency translation	2.6	3.0	5.2	5.8
Acquisitions of intangible assets				3.9
Other intangible assets, ending balance	$ 17.8	$ 27.4	$ 17.8	$ 27.4