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Business Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Segment | Jun. 30, 2015 USD ($)
Business Segments [Abstract] |  |  |  |
Number of reportable segments | Segment |  |  | 5 |
Segment Gross Operating Margin [Abstract] |  |  |  |
Revenues | $ 5,617.8 | $ 7,092.5 | $ 10,623.1 | $ 14,565.0
Subtract operating costs and expenses | (4,822.2) | (6,357.5) | (8,969.1) | (12,973.9)
Add equity in income of unconsolidated affiliates | 76.4 | 110.2 | 177.5 | 199.4
Add depreciation, amortization and accretion expense amounts not reflected in gross operating margin | 360.3 | 385.6 | 718.5 | 730.9
Add asset impairment charges not reflected in gross operating margin | 13.1 | 79.0 | 14.8 | 112.3
Add net losses or subtract net gains attributable to asset sales, insurance recoveries and related property damage not reflected in gross operating margin | 8.8 | 2.5 | 13.7 | 2.4
Add non-refundable payments attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin | 1.8 | 5.2 | 8.9 | 35.9
Subtract subsequent revenue recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin | (6.6) | (14.3) | (19.5) | (34.4)
Total segment gross operating margin | 1,249.4 | 1,303.2 | 2,567.9 | 2,637.6
Reconciliation of total Segment Gross Operating Margin [Abstract] |  |  |  |
Total segment gross operating margin | 1,249.4 | 1,303.2 | 2,567.9 | 2,637.6
Adjustments to reconcile total segment gross operating margin to operating income: |  |  |  |
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin | (360.3) | (385.6) | (718.5) | (730.9)
Subtract asset impairment charges not reflected in gross operating margin | (13.1) | (79.0) | (14.8) | (112.3)
Add net gains or subtract net losses attributable to asset sales, insurance recoveries and related property damage not reflected in gross operating margin | (8.8) | (2.5) | (13.7) | (2.4)
Subtract non-refundable payments attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin | (1.8) | (5.2) | (8.9) | (35.9)
Add subsequent revenue recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin | 6.6 | 14.3 | 19.5 | 34.4
Subtract general and administrative costs not reflected in gross operating margin | (35.1) | (44.9) | (79.0) | (94.2)
Operating income | 836.9 | 800.3 | 1,752.5 | 1,696.3
Other expense, net | (267.0) | (251.6) | (504.0) | (490.2)
Income before income taxes | $ 569.9 | $ 548.7 | $ 1,248.5 | $ 1,206.1

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