Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	12 years 7 months 30 days		12 years 10 months 30 days
Gross Carrying Amount	$ 456.4		$ 456.4
Accumulated Amortization	97.6		$ 89.3
Intangible assets amortization expense	$ 8.3	$ 5.7
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	12 years 10 months 30 days		13 years 1 month
Gross Carrying Amount	$ 424.5		$ 424.5
Accumulated Amortization	$ 86.8		$ 79.8
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	10 years 7 months 30 days		10 years 5 months 30 days
Gross Carrying Amount	$ 27.7		$ 27.7
Accumulated Amortization	$ 9.3		$ 8.1
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	4 years 3 months 30 days		4 years 3 months
Gross Carrying Amount	$ 4.2		$ 4.2
Accumulated Amortization	$ 1.5		$ 1.4