Goodwill and Other Intangible Assets - Gross and Net Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 200.6	$ 15.6
Accumulated Amortization	10.4	5.2
Total	$ 190.2	10.4
Customer contracts
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization (in years)	6 years
Gross Carrying Amount	$ 31.7	7.7
Accumulated Amortization	6.1	4.2
Total	$ 25.6	3.5
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization (in years)	14 years
Gross Carrying Amount	$ 28.7	6.7
Accumulated Amortization	1.8	0.7
Total	$ 26.9	6.0
Permits
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization (in years)	27 years
Gross Carrying Amount	$ 139.0	0.0
Accumulated Amortization	1.9	0.0
Total	$ 137.1	0.0
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization (in years)	3 years
Gross Carrying Amount	$ 1.2	1.2
Accumulated Amortization	0.6	0.3
Total	$ 0.6	$ 0.9