Commitments and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Self Insurance Reserve	$ 15.8	$ 15.6
Self Insurance Reserve Expected To Be Paid Subsequent To Next Fiscal Year	10.6
Accrued property taxes	6.3	4.2
Loss Contingency Accrual, at Carrying Value		0.1
Crestwood Midstream Partners LP
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Self Insurance Reserve	12.9	12.2
Self Insurance Reserve Expected To Be Paid Subsequent To Next Fiscal Year	8.0
Accrued property taxes	$ 6.3	$ 4.2