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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The following table reflects the carrying value (reduced for deferred financing costs associated with the respective notes) and fair value of our CMLP senior notes (in millions):
 
December 31, 2016
 
December 31, 2015
 
Carrying Amount
 
Fair
Value
 
Carrying Amount
 
Fair
Value
Crestwood Midstream 2020 Senior Notes
$
340.6

 
$
350.2

 
$
503.3

 
$
382.3

Crestwood Midstream 2022 Senior Notes
$
429.3

 
$
447.3

 
$
588.4

 
$
437.4

Crestwood Midstream 2023 Senior Notes
$
690.6

 
$
722.6

 
$
689.4

 
$
491.8
Assets And Liabilities Measured At Fair Value On Recurring Basis
The following tables set forth by level within the fair value hierarchy, our financial instruments that were accounted for at fair value on a recurring basis at December 31, 2016 and 2015 (in millions):
 
December 31, 2016
 
 
 
Fair Value of Derivatives
 
 
 
 
 
 
Level 1
 
Level 2
 
Level 3
 
Gross Fair Value
 
Contract Netting(1)
 
Collateral/Margin Received or Paid
 
Recorded in Balance Sheet
Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets from price risk management
$
0.6

 
$
84.4

 
$
—

 
$
85.0

 
$
(67.8
)
 
$
(10.9
)
 
$
6.3

Suburban Propane Partners, L.P. units(2)
4.3

 
—

 
—

 
4.3

 
—

 
—

 
4.3

Total assets at fair value
$
4.9

 
$
84.4

 
$
—

 
$
89.3

 
$
(67.8
)
 
$
(10.9
)
 
$
10.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities from price risk management
$
2.7

 
$
90.2

 
$
—

 
$
92.9

 
$
(67.8
)
 
$
3.5

 
$
28.6

Total liabilities at fair value
$
2.7

 
$
90.2

 
$
—

 
$
92.9

 
$
(67.8
)
 
$
3.5

 
$
28.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
 
 
Fair Value of Derivatives
 
 
 
 
 
 
Level 1
 
Level 2
 
Level 3
 
Gross Fair Value
 
Contract Netting(1)
 
Collateral/Margin Received or Paid
 
Recorded in Balance Sheet
Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets from price risk management
$
0.5

 
$
57.8

 
$
—

 
$
58.3

 
$
(13.7
)
 
$
(12.0
)
 
$
32.6

Suburban Propane Partners, L.P. units(2)
3.4

 
—

 
—

 
3.4

 
—

 
—

 
3.4

Total assets at fair value
$
3.9

 
$
57.8

 
$
—

 
$
61.7

 
$
(13.7
)
 
$
(12.0
)
 
$
36.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities from price risk management
$
0.2

 
$
41.3

 
$
—

 
$
41.5

 
$
(13.7
)
 
$
(20.4
)
 
$
7.4

Total liabilities at fair value
$
0.2

 
$
41.3

 
$
—

 
$
41.5

 
$
(13.7
)
 
$
(20.4
)
 
$
7.4


(1)
Amounts represent the impact of legally enforceable master netting agreements that allow us to settle positive and negative positions as well as cash collateral held or placed with the same counterparties.