Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Intangible assets
Indefinite-lived trade name intangible asset	$ 186.1	$ 186.1
Gross Carrying Amount	531.7	521.8
Accumulated Amortization	271.0	233.5
Net Carrying Amount	$ 260.7	288.3
Weighted average useful lives of acquired amortizable intangible assets	10 years
Customer relationships
Intangible assets
Gross Carrying Amount	$ 390.2	381.1
Accumulated Amortization	188.9	159.1
Net Carrying Amount	$ 201.3	222.0
Weighted average useful lives of acquired amortizable intangible assets	10 years
Proprietary technology
Intangible assets
Gross Carrying Amount	$ 107.5	106.7
Accumulated Amortization	48.5	40.9
Net Carrying Amount	$ 59.0	65.8
Weighted average useful lives of acquired amortizable intangible assets	11 years
Backlog and other
Intangible assets
Gross Carrying Amount	$ 34.0	34.0
Accumulated Amortization	33.6	33.5
Net Carrying Amount	$ 0.4	$ 0.5
Weighted average useful lives of acquired amortizable intangible assets	2 years