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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities:    
Net income $ 1,207.2 $ 1,453.2
Reconciliation of net income to net cash flows provided by operating activities:    
Depreciation, amortization and accretion 774.9 651.0
Non-cash asset impairment charges (see Note 4) 112.3 12.5
Equity in income of unconsolidated affiliates (199.4) (106.8)
Distributions received from unconsolidated affiliates 265.5 157.1
Net losses (gains) attributable to asset sales and insurance recoveries (see Note 16) 2.4 (96.4)
Deferred income tax expense (benefit) (11.7) 0.6
Changes in fair value of Liquidity Option Agreement 11.5 0.0
Changes in fair market value of derivative instruments (9.9) (6.2)
Net effect of changes in operating accounts (see Note 16) (250.7) (198.6)
Other operating activities (0.5) 5.5
Net cash flows provided by operating activities 1,901.6 1,871.9
Investing activities:    
Capital expenditures (1,638.0) (1,186.4)
Contributions in aid of construction costs 7.8 13.9
Decrease (increase) in restricted cash (46.1) 8.9
Investments in unconsolidated affiliates (114.1) (498.8)
Proceeds from asset sales and insurance recoveries (see Note 16) 5.9 113.2
Other investing activities (4.8) (5.7)
Cash used in investing activities (1,789.3) (1,554.9)
Financing activities:    
Borrowings under debt agreements 13,838.3 4,182.8
Repayments of debt (12,905.0) (3,161.3)
Debt issuance costs (18.6) (18.1)
Cash distributions paid to limited partners (see Note 11) (1,437.3) (1,288.4)
Cash payments made in connection with distribution equivalent rights (3.4) (1.2)
Cash distributions paid to noncontrolling interests (24.8) (19.7)
Cash contributions from noncontrolling interests 22.0 4.0
Net cash proceeds from the issuance of common units 944.1 223.3
Other financing activities (50.9) (53.3)
Cash provided by (used in) financing activities 364.4 (131.9)
Net change in cash and cash equivalents 476.7 185.1
Cash and cash equivalents, beginning balance 74.4 56.9
Cash and cash equivalents, ending balance $ 551.1 $ 242.0