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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating activities: |  |
Net income | $ 911.5 | $ 771.0
Reconciliation of net income to net cash flows provided by operating activities: |  |
Depreciation, amortization and accretion | 431.0 | 402.3
Asset impairment and related charges | 0.9 | 11.2
Equity in income of unconsolidated affiliates | (115.7) | (94.8)
Distributions received on earnings from unconsolidated affiliates | 107.5 | 90.5
Net gains attributable to asset sales | (0.5) | (0.3)
Deferred income tax expense (benefit) | (1.1) | 0.1
Change in fair market value of derivative instruments | 136.9 | (20.3)
Change in fair market value of Liquidity Option Agreement | 7.5 | 5.5
Gain on step acquisition of unconsolidated affiliate | (37.0) | 0.0
Net effect of changes in operating accounts | (203.1) | (288.8)
Other operating activities | (4.3) | (0.8)
Net cash flows provided by operating activities | 1,233.6 | 875.6
Investing activities: |  |
Capital expenditures | (946.5) | (430.4)
Cash used for business combinations, net of cash received | (149.8) | (16.0)
Investments in unconsolidated affiliates | (37.9) | (13.7)
Distributions received for return of capital from unconsolidated affiliates | 14.9 | 12.0
Proceeds from asset sales | 1.1 | 2.0
Other investing activities | (0.9) | 2.1
Cash used in investing activities | (1,119.1) | (444.0)
Financing activities: |  |
Borrowings under debt agreements | 16,283.8 | 17,575.1
Repayments of debt | (15,444.7) | (17,856.5)
Debt issuance costs | (24.2) | 0.0
Monetization of interest rate derivative instruments | 1.5 | 0.0
Cash distributions paid to limited partners | (918.5) | (869.0)
Cash payments made in connection with distribution equivalent rights | (3.9) | (3.2)
Cash distributions paid to noncontrolling interests | (15.4) | (10.1)
Cash contributions from noncontrolling interests | 0.1 | 0.2
Net cash proceeds from the issuance of common units | 177.0 | 448.8
Other financing activities | (24.9) | (27.4)
Cash provided by (used in) financing activities | 30.8 | (742.1)
Net change in cash and cash equivalents, including restricted cash | 145.3 | (310.5)
Cash and cash equivalents, including restricted cash, at beginning of period | 70.3 | 417.6
Cash and cash equivalents, including restricted cash, at end of period | $ 215.6 | $ 107.1

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- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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