Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	11 years 8 months 12 days	12 years 10 months 24 days
Gross Carrying Amount	$ 535.0	$ 456.4
Accumulated Amortization	$ 125.0	$ 89.3
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	11 years 9 months 18 days	13 years 1 month 6 days
Gross Carrying Amount	$ 497.8	$ 424.5
Accumulated Amortization	$ 109.8	$ 79.8
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	9 years 9 months 18 days	10 years 6 months
Gross Carrying Amount	$ 32.9	$ 27.7
Accumulated Amortization	$ 13.2	$ 8.1
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	3 years 7 months 6 days	4 years 3 months 18 days
Gross Carrying Amount	$ 4.3	$ 4.2
Accumulated Amortization	$ 2.0	$ 1.4