Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net loss	$ (192.1)	$ (2,303.7)	$ (10.4)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	229.6	300.1	285.3
Amortization of debt-related deferred costs, discounts and premiums	6.9	8.9	8.5
Market adjustment on interest rate swaps	0.0	(0.5)	(2.7)
Unit-based compensation charges	19.2	19.7	21.3
Loss on long-lived assets, net	(65.6)	(821.2)	(1.9)
Goodwill impairment	162.6	1,406.3	48.8
Loss on contingent consideration	0.0	0.0	8.6
(Gain) loss on modification/extinguishment of debt	(10.0)	20.0	0.0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	7.6	73.6	0.7
Deferred income taxes	(3.1)	(3.6)	(5.2)
Other	1.9	0.7	0.0
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(76.9)	119.7	60.4
Inventory	(22.5)	2.0	26.9
Prepaid expenses and other current assets	9.2	1.8	(11.4)
Accounts payable, accrued expenses and other liabilities	74.6	(128.0)	(96.4)
Reimbursements of property, plant and equipment	26.0	73.3	21.5
Change in price risk management activities, net	47.5	29.2	(74.8)
Net cash provided by operating activities	346.1	440.7	283.0
Investing activities
Acquisitions, net of cash acquired	(7.2)	0.0	(19.5)
Purchases of property, plant and equipment	(100.7)	(182.7)	(424.0)
Investment in unconsolidated affiliates	(12.4)	(42.0)	(108.6)
Capital distributions from unconsolidated affiliates	14.8	9.3	0.0
Proceeds from sale of assets	972.7	2.7	69.1
Net cash provided by (used in) investing activities	867.2	(212.7)	(483.0)
Financing activities
Proceeds from the issuance of long-term debt	1,565.3	4,261.8	2,823.9
Principal payments on long-term debt	(2,536.3)	(4,113.0)	(2,696.0)
Payments on capital leases	(1.9)	(2.2)	(3.2)
Payments for debt-related deferred costs	(3.5)	(17.3)	(1.9)
Financing fees paid for early debt redemption	0.0	(13.6)	0.0
Distributions to partners	(219.8)	(171.5)	(102.5)
Distributions paid to non-controlling partners	(15.2)	(234.2)	(296.5)
Net proceeds from issuance of preferred equity of subsidiary	0.0	0.0	53.9
Taxes paid for unit-based compensation vesting	(0.8)	(3.8)	(3.9)
Other	0.0	(1.3)	(0.7)
Net cash provided by (used in) financing activities	(1,212.2)	(236.3)	203.6
Net change in cash	1.1	(8.3)	3.6
Cash at beginning of period	0.5	8.8	5.2
Cash at end of period	1.6	0.5	8.8
Supplemental disclosure of cash flow information
Cash paid during the period for interest	121.5	129.0	114.4
Cash paid during the period for income taxes	1.4	4.7	6.6
Supplemental schedule of noncash investing and financing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(10.5)	(14.1)	(40.6)
Preferred Units, Class A
Financing activities
Net proceeds from issuance of preferred equity of subsidiary	0.0	58.8	430.5
CMLP
Operating activities
Net loss	(197.5)	(1,410.6)	14.7
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	240.5	278.5	255.4
Amortization of debt-related deferred costs, discounts and premiums	6.9	8.1	7.3
Unit-based compensation charges	19.2	18.1	18.1
Loss on long-lived assets, net	(65.6)	(227.8)	(35.1)
Goodwill impairment	162.6	1,149.1	48.8
Loss on contingent consideration	0.0	0.0	8.6
(Gain) loss on modification/extinguishment of debt	(10.0)	18.9	0.0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	7.6	73.6	0.7
Deferred income taxes	0.2	(0.3)	0.7
Other	1.9	0.7	0.0
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(76.9)	119.4	60.4
Inventory	(22.5)	2.1	26.9
Prepaid expenses and other current assets	7.5	3.7	(11.9)
Accounts payable, accrued expenses and other liabilities	75.2	(119.8)	25.8
Reimbursements of property, plant and equipment	26.0	73.3	21.5
Change in price risk management activities, net	47.5	29.2	(74.8)
Net cash provided by operating activities	353.8	471.8	437.3
Investing activities
Acquisitions, net of cash acquired	(7.2)	0.0	(19.5)
Purchases of property, plant and equipment	(100.7)	(182.7)	(421.7)
Investment in unconsolidated affiliates	(12.4)	(41.8)	(144.4)
Capital distributions from unconsolidated affiliates	14.8	9.3	0.0
Proceeds from sale of assets	972.7	2.7	2.7
Net cash provided by (used in) investing activities	867.2	(212.5)	(582.9)
Financing activities
Proceeds from the issuance of long-term debt	1,565.3	3,490.1	2,089.9
Principal payments on long-term debt	(2,536.1)	(2,960.9)	(1,950.0)
Payments on capital leases	(1.9)	(2.2)	(3.2)
Payments for debt-related deferred costs	(3.5)	(17.3)	(0.1)
Financing fees paid for early debt redemption	0.0	(13.6)	0.0
Distributions to partners	(242.8)	(819.5)	(470.5)
Net proceeds from issuance of preferred equity of subsidiary	0.0	0.0	53.9
Issuance of CMLP Class A preferred units	0.0	58.8	430.5
Taxes paid for unit-based compensation vesting	(0.8)	(2.1)	(1.6)
Other	0.0	(0.1)	(0.8)
Net cash provided by (used in) financing activities	(1,219.8)	(266.8)	148.1
Net change in cash	1.2	(7.5)	2.5
Cash at beginning of period	0.1	7.6	5.1
Cash at end of period	1.3	0.1	7.6
Supplemental disclosure of cash flow information
Cash paid during the period for interest	121.5	118.2	96.9
Cash paid during the period for income taxes	0.7	0.6	0.4
Supplemental schedule of noncash investing and financing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$ (10.5)	$ (14.1)	$ (40.6)