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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables) | 9 Months Ended
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Sep. 30, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Consolidating Statements of Income | Condensed Consolidating Statements of Income
| Three Months Ended September 30, 2018
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,083.6 |  |  | $ | — |  |  | $ | 3,083.6 |
Services | — |  |  | — |  |  | — |  |  | 310.8 |  |  | (0.5 | ) |  | 310.3 |
Total revenues | — |  |  | — |  |  | — |  |  | 3,394.4 |  |  | (0.5 | ) |  | 3,393.9 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 2,560.8 |  |  | — |  |  | 2,560.8 |
Operating expenses | 2.0 |  |  | — |  |  | — |  |  | 336.3 |  |  | (0.5 | ) |  | 337.8 |
Gain on sale of assets | — |  |  | — |  |  | — |  |  | (0.2 | ) |  | — |  |  | (0.2 | )
Operating income | (2.0 | ) |  | — |  |  | — |  |  | 497.5 |  |  | — |  |  | 495.5 |
Equity in net earnings from investments | 457.3 |  |  | 457.1 |  |  | 457.1 |  |  | 30.1 |  |  | (1,362.3 | ) |  | 39.3 |
Other income (expense), net | 9.3 |  |  | 80.3 |  |  | 80.3 |  |  | (5.3 | ) |  | (160.6 | ) |  | 4.0 |
Interest expense, net | (49.1 | ) |  | (80.3 | ) |  | (80.3 | ) |  | (72.8 | ) |  | 160.6 |  |  | (121.9 | )
Income before income taxes | 415.5 |  |  | 457.1 |  |  | 457.1 |  |  | 449.5 |  |  | (1,362.3 | ) |  | 416.9 |
Income taxes | (102.3 | ) |  | — |  |  | — |  |  | (0.7 | ) |  | — |  |  | (103.0 | )
Net income | 313.2 |  |  | 457.1 |  |  | 457.1 |  |  | 448.8 |  |  | (1,362.3 | ) |  | 313.9 |
Less: Net income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 0.7 |  |  | — |  |  | 0.7 |
Net income attributable to ONEOK | 313.2 |  |  | 457.1 |  |  | 457.1 |  |  | 448.1 |  |  | (1,362.3 | ) |  | 313.2 |
Less: Preferred stock dividends | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.2 |
Net income available to common shareholders | $ | 313.0 |  |  | $ | 457.1 |  |  | $ | 457.1 |  |  | $ | 448.1 |  |  | $ | (1,362.3 | ) |  | $ | 313.0 |
| Three Months Ended September 30, 2017
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,322.5 |  |  | $ | — |  |  | $ | 2,322.5 |
Services | — |  |  | — |  |  | — |  |  | 584.3 |  |  | (0.5 | ) |  | 583.8 |
Total revenues | — |  |  | — |  |  | — |  |  | 2,906.8 |  |  | (0.5 | ) |  | 2,906.3 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 2,229.4 |  |  | — |  |  | 2,229.4 |
Operating expenses | 1.2 |  |  | — |  |  | 2.6 |  |  | 303.3 |  |  | (0.5 | ) |  | 306.6 |
Impairment of long-lived assets | — |  |  | — |  |  | — |  |  | 16.0 |  |  | — |  |  | 16.0 |
Gain on sale of assets | — |  |  | — |  |  | — |  |  | (0.3 | ) |  | — |  |  | (0.3 | )
Operating income | (1.2 | ) |  | — |  |  | (2.6 | ) |  | 358.4 |  |  | — |  |  | 354.6 |
Equity in net earnings from investments | 298.0 |  |  | 298.3 |  |  | 300.9 |  |  | 27.6 |  |  | (884.7 | ) |  | 40.1 |
Impairment of equity investments | — |  |  | — |  |  | — |  |  | (4.3 | ) |  | — |  |  | (4.3 | )
Other income (expense), net | 4.1 |  |  | 86.1 |  |  | 86.1 |  |  | (4.3 | ) |  | (172.2 | ) |  | (0.2 | )
Interest expense, net | (43.2 | ) |  | (86.1 | ) |  | (86.1 | ) |  | (83.3 | ) |  | 172.2 |  |  | (126.5 | )
Income before income taxes | 257.7 |  |  | 298.3 |  |  | 298.3 |  |  | 294.1 |  |  | (884.7 | ) |  | 263.7 |
Income taxes | (91.9 | ) |  | — |  |  | — |  |  | (5.3 | ) |  | — |  |  | (97.2 | )
Net income | 165.8 |  |  | 298.3 |  |  | 298.3 |  |  | 288.8 |  |  | (884.7 | ) |  | 166.5 |
Less: Net income attributable to noncontrolling interests | 0.1 |  |  | — |  |  | — |  |  | 0.7 |  |  | — |  |  | 0.8 |
Net income attributable to ONEOK | 165.7 |  |  | 298.3 |  |  | 298.3 |  |  | 288.1 |  |  | (884.7 | ) |  | 165.7 |
Less: Preferred stock dividends | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.2 |
Net income available to common shareholders | $ | 165.5 |  |  | $ | 298.3 |  |  | $ | 298.3 |  |  | $ | 288.1 |  |  | $ | (884.7 | ) |  | $ | 165.5 |
| Nine Months Ended September 30, 2018
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8,578.9 |  |  | $ | — |  |  | $ | 8,578.9 |
Services | — |  |  | — |  |  | — |  |  | 879.1 |  |  | (1.5 | ) |  | 877.6 |
Total revenues | — |  |  | — |  |  | — |  |  | 9,458.0 |  |  | (1.5 | ) |  | 9,456.5 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 7,104.6 |  |  | — |  |  | 7,104.6 |
Operating expenses | 3.3 |  |  | — |  |  | — |  |  | 986.8 |  |  | (1.5 | ) |  | 988.6 |
Gain on sale of assets | — |  |  | — |  |  | — |  |  | (0.3 | ) |  | — |  |  | (0.3 | )
Operating income | (3.3 | ) |  | — |  |  | — |  |  | 1,366.9 |  |  | — |  |  | 1,363.6 |
Equity in net earnings from investments | 1,226.6 |  |  | 1,231.2 |  |  | 1,231.2 |  |  | 86.2 |  |  | (3,659.1 | ) |  | 116.1 |
Other income (expense), net | 23.1 |  |  | 234.9 |  |  | 234.9 |  |  | (23.3 | ) |  | (469.8 | ) |  | (0.2 | )
Interest expense, net | (129.2 | ) |  | (234.9 | ) |  | (234.9 | ) |  | (221.9 | ) |  | 469.8 |  |  | (351.1 | )
Income before income taxes | 1,117.2 |  |  | 1,231.2 |  |  | 1,231.2 |  |  | 1,207.9 |  |  | (3,659.1 | ) |  | 1,128.4 |
Income taxes | (258.4 | ) |  | — |  |  | — |  |  | (7.9 | ) |  | — |  |  | (266.3 | )
Net income | 858.8 |  |  | 1,231.2 |  |  | 1,231.2 |  |  | 1,200.0 |  |  | (3,659.1 | ) |  | 862.1 |
Less: Net income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 3.3 |  |  | — |  |  | 3.3 |
Net income attributable to ONEOK | 858.8 |  |  | 1,231.2 |  |  | 1,231.2 |  |  | 1,196.7 |  |  | (3,659.1 | ) |  | 858.8 |
Less: Preferred stock dividends | 0.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.8 |
Net income available to common shareholders | $ | 858.0 |  |  | $ | 1,231.2 |  |  | $ | 1,231.2 |  |  | $ | 1,196.7 |  |  | $ | (3,659.1 | ) |  | $ | 858.0 |
| Nine Months Ended September 30, 2017
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 6,700.3 |  |  | $ | — |  |  | $ | 6,700.3 |
Services | — |  |  | — |  |  | — |  |  | 1,683.0 |  |  | (1.5 | ) |  | 1,681.5 |
Total revenues | — |  |  | — |  |  | — |  |  | 8,383.3 |  |  | (1.5 | ) |  | 8,381.8 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 6,464.3 |  |  | — |  |  | 6,464.3 |
Operating expenses | 25.9 |  |  | — |  |  | 8.8 |  |  | 878.0 |  |  | (1.5 | ) |  | 911.2 |
Impairment of long-lived assets | — |  |  | — |  |  | — |  |  | 16.0 |  |  | — |  |  | 16.0 |
Gain on sale of assets | — |  |  | — |  |  | — |  |  | (0.9 | ) |  | — |  |  | (0.9 | )
Operating income | (25.9 | ) |  | — |  |  | (8.8 | ) |  | 1,025.9 |  |  | — |  |  | 991.2 |
Equity in net earnings from investments | 842.0 |  |  | 845.9 |  |  | 854.7 |  |  | 72.1 |  |  | (2,495.7 | ) |  | 119.0 |
Impairment of equity investments | — |  |  | — |  |  | — |  |  | (4.3 | ) |  | — |  |  | (4.3 | )
Other income (expense), net | (15.5 | ) |  | 272.2 |  |  | 272.2 |  |  | (4.3 | ) |  | (544.4 | ) |  | (19.8 | )
Interest expense, net | (93.5 | ) |  | (272.2 | ) |  | (272.2 | ) |  | (268.0 | ) |  | 544.4 |  |  | (361.5 | )
Income before income taxes | 707.1 |  |  | 845.9 |  |  | 845.9 |  |  | 821.4 |  |  | (2,495.7 | ) |  | 724.6 |
Income taxes | (180.9 | ) |  | — |  |  | — |  |  | (15.0 | ) |  | — |  |  | (195.9 | )
Net income | 526.2 |  |  | 845.9 |  |  | 845.9 |  |  | 806.4 |  |  | (2,495.7 | ) |  | 528.7 |
Less: Net income attributable to noncontrolling interests | 201.4 |  |  | — |  |  | — |  |  | 2.5 |  |  | — |  |  | 203.9 |
Net income attributable to ONEOK | 324.8 |  |  | 845.9 |  |  | 845.9 |  |  | 803.9 |  |  | (2,495.7 | ) |  | 324.8 |
Less: Preferred stock dividends | 0.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.5 |
Net income available to common shareholders | $ | 324.3 |  |  | $ | 845.9 |  |  | $ | 845.9 |  |  | $ | 803.9 |  |  | $ | (2,495.7 | ) |  | $ | 324.3 |
Condensed Consolidating Statements of Comprehensive Income | Condensed Consolidating Statements of Comprehensive Income
| Three Months Ended September 30, 2018
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 313.2 |  |  | $ | 457.1 |  |  | $ | 457.1 |  |  | $ | 448.8 |  |  | $ | (1,362.3 | ) |  | $ | 313.9 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 20.2 |  |  | (30.7 | ) |  | (30.7 | ) |  | (23.7 | ) |  | 61.4 |  |  | (3.5 | )
Realized (gains) losses on derivatives in net income, net of tax | — |  |  | 25.0 |  |  | 20.6 |  |  | 14.9 |  |  | (41.2 | ) |  | 19.3 |
Change in pension and postretirement benefit plan liability, net of tax | 3.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3.2 |
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | 2.0 |  |  | 2.0 |  |  | 1.5 |  |  | (4.0 | ) |  | 1.5 |
Total other comprehensive income (loss), net of tax | 23.4 |  |  | (3.7 | ) |  | (8.1 | ) |  | (7.3 | ) |  | 16.2 |  |  | 20.5 |
Comprehensive income | 336.6 |  |  | 453.4 |  |  | 449.0 |  |  | 441.5 |  |  | (1,346.1 | ) |  | 334.4 |
Less: Comprehensive income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 0.7 |  |  | — |  |  | 0.7 |
Comprehensive income attributable to ONEOK | $ | 336.6 |  |  | $ | 453.4 |  |  | $ | 449.0 |  |  | $ | 440.8 |  |  | $ | (1,346.1 | ) |  | $ | 333.7 |
| Three Months Ended September 30, 2017
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 165.8 |  |  | $ | 298.3 |  |  | $ | 298.3 |  |  | $ | 288.8 |  |  | $ | (884.7 | ) |  | $ | 166.5 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 18.4 |  |  | (61.9 | ) |  | (42.4 | ) |  | (19.5 | ) |  | 84.8 |  |  | (20.6 | )
Realized (gains) losses on derivatives in net income, net of tax | 0.6 |  |  | 19.8 |  |  | 15.9 |  |  | 8.6 |  |  | (31.8 | ) |  | 13.1 |
Change in pension and postretirement benefit plan liability, net of tax | 2.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2.0 |
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | (0.3 | ) |  | (0.3 | ) |  | (0.2 | ) |  | 0.6 |  |  | (0.2 | )
Total other comprehensive income (loss), net of tax | 21.0 |  |  | (42.4 | ) |  | (26.8 | ) |  | (11.1 | ) |  | 53.6 |  |  | (5.7 | )
Comprehensive income | 186.8 |  |  | 255.9 |  |  | 271.5 |  |  | 277.7 |  |  | (831.1 | ) |  | 160.8 |
Less: Comprehensive income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 0.7 |  |  | — |  |  | 0.7 |
Comprehensive income attributable to ONEOK | $ | 186.8 |  |  | $ | 255.9 |  |  | $ | 271.5 |  |  | $ | 277.0 |  |  | $ | (831.1 | ) |  | $ | 160.1 |
| Nine Months Ended September 30, 2018
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 858.8 |  |  | $ | 1,231.2 |  |  | $ | 1,231.2 |  |  | $ | 1,200.0 |  |  | $ | (3,659.1 | ) |  | $ | 862.1 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 54.0 |  |  | (56.2 | ) |  | (56.2 | ) |  | (43.3 | ) |  | 112.4 |  |  | 10.7 |
Realized (gains) losses on derivatives in net income, net of tax | 1.9 |  |  | 53.9 |  |  | 42.4 |  |  | 30.0 |  |  | (84.8 | ) |  | 43.4 |
Change in pension and postretirement benefit plan liability, net of tax | 9.7 |  |  | (0.6 | ) |  | — |  |  | — |  |  | — |  |  | 9.1 |
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | 6.9 |  |  | 6.9 |  |  | 5.3 |  |  | (13.8 | ) |  | 5.3 |
Total other comprehensive income (loss), net of tax | 65.6 |  |  | 4.0 |  |  | (6.9 | ) |  | (8.0 | ) |  | 13.8 |  |  | 68.5 |
Comprehensive income | 924.4 |  |  | 1,235.2 |  |  | 1,224.3 |  |  | 1,192.0 |  |  | (3,645.3 | ) |  | 930.6 |
Less: Comprehensive income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 3.3 |  |  | — |  |  | 3.3 |
Comprehensive income attributable to ONEOK | $ | 924.4 |  |  | $ | 1,235.2 |  |  | $ | 1,224.3 |  |  | $ | 1,188.7 |  |  | $ | (3,645.3 | ) |  | $ | 927.3 |
| Nine Months Ended September 30, 2017
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 526.2 |  |  | $ | 845.9 |  |  | $ | 845.9 |  |  | $ | 806.4 |  |  | $ | (2,495.7 | ) |  | $ | 528.7 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 18.1 |  |  | (38.8 | ) |  | (6.1 | ) |  | 13.3 |  |  | 12.2 |  |  | (1.3 | )
Realized (gains) losses on derivatives in net income, net of tax | 1.6 |  |  | 50.7 |  |  | 38.0 |  |  | 26.0 |  |  | (76.0 | ) |  | 40.3 |
Change in pension and postretirement benefit plan liability, net of tax | 6.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 6.1 |
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | (1.5 | ) |  | (1.5 | ) |  | (1.2 | ) |  | 3.0 |  |  | (1.2 | )
Total other comprehensive income (loss), net of tax | 25.8 |  |  | 10.4 |  |  | 30.4 |  |  | 38.1 |  |  | (60.8 | ) |  | 43.9 |
Comprehensive income | 552.0 |  |  | 856.3 |  |  | 876.3 |  |  | 844.5 |  |  | (2,556.5 | ) |  | 572.6 |
Less: Comprehensive income attributable to noncontrolling interests | 232.4 |  |  | — |  |  | — |  |  | 2.5 |  |  | — |  |  | 234.9 |
Comprehensive income attributable to ONEOK | $ | 319.6 |  |  | $ | 856.3 |  |  | $ | 876.3 |  |  | $ | 842.0 |  |  | $ | (2,556.5 | ) |  | $ | 337.7 |
Condensed Consolidating Balance Sheets | Condensed Consolidating Balance Sheets
| September 30, 2018
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
Assets | (Millions of dollars)
Current assets |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 84.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 84.5 |
Accounts receivable, net | — |  |  | — |  |  | — |  |  | 1,085.1 |  |  | — |  |  | 1,085.1 |
Materials and supplies | — |  |  | — |  |  | — |  |  | 128.6 |  |  | — |  |  | 128.6 |
Natural gas and natural gas liquids in storage | — |  |  | — |  |  | — |  |  | 426.3 |  |  | — |  |  | 426.3 |
Other current assets | 10.4 |  |  | — |  |  | — |  |  | 73.0 |  |  | — |  |  | 83.4 |
Total current assets | 94.9 |  |  | — |  |  | — |  |  | 1,713.0 |  |  | — |  |  | 1,807.9 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 141.0 |  |  | — |  |  | — |  |  | 16,979.2 |  |  | — |  |  | 17,120.2 |
Accumulated depreciation and amortization | 90.5 |  |  | — |  |  | — |  |  | 3,069.2 |  |  | — |  |  | 3,159.7 |
Net property, plant and equipment | 50.5 |  |  | — |  |  | — |  |  | 13,910.0 |  |  | — |  |  | 13,960.5 |
Investments and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments | 5,977.5 |  |  | 3,359.0 |  |  | 9,223.2 |  |  | 796.8 |  |  | (18,374.9 | ) |  | 981.6 |
Intercompany notes receivable | 4,769.1 |  |  | 7,682.5 |  |  | 1,818.3 |  |  | — |  |  | (14,269.9 | ) |  | — |
Other assets | 174.3 |  |  | — |  |  | — |  |  | 988.2 |  |  | (1.2 | ) |  | 1,161.3 |
Total investments and other assets | 10,920.9 |  |  | 11,041.5 |  |  | 11,041.5 |  |  | 1,785.0 |  |  | (32,646.0 | ) |  | 2,142.9 |
Total assets | $ | 11,066.3 |  |  | $ | 11,041.5 |  |  | $ | 11,041.5 |  |  | $ | 17,408.0 |  |  | $ | (32,646.0 | ) |  | $ | 17,911.3 |
Liabilities and equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt | $ | — |  |  | $ | 500.0 |  |  | $ | — |  |  | $ | 7.7 |  |  | $ | — |  |  | $ | 507.7 |
Short-term borrowings | 120.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 120.0 |
Accounts payable | 5.1 |  |  | — |  |  | — |  |  | 1,334.4 |  |  | — |  |  | 1,339.5 |
Other current liabilities | 71.8 |  |  | 67.6 |  |  | — |  |  | 343.6 |  |  | — |  |  | 483.0 |
Total current liabilities | 196.9 |  |  | 567.6 |  |  | — |  |  | 1,685.7 |  |  | — |  |  | 2,450.2 |
Intercompany debt | — |  |  | — |  |  | 7,682.5 |  |  | 6,587.4 |  |  | (14,269.9 | ) |  | — |
Long-term debt, excluding current maturities | 3,962.2 |  |  | 4,340.4 |  |  | — |  |  | 23.1 |  |  | — |  |  | 8,325.7 |
Deferred credits and other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 25.8 |  |  | — |  |  | — |  |  | 107.6 |  |  | (1.2 | ) |  | 132.2 |
Other deferred credits | 228.6 |  |  | — |  |  | — |  |  | 121.8 |  |  | — |  |  | 350.4 |
Total deferred credits and other liabilities | 254.4 |  |  | — |  |  | — |  |  | 229.4 |  |  | (1.2 | ) |  | 482.6 |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | 6,652.8 |  |  | 6,133.5 |  |  | 3,359.0 |  |  | 8,882.4 |  |  | (18,374.9 | ) |  | 6,652.8 |
Total liabilities and equity | $ | 11,066.3 |  |  | $ | 11,041.5 |  |  | $ | 11,041.5 |  |  | $ | 17,408.0 |  |  | $ | (32,646.0 | ) |  | $ | 17,911.3 |
| December 31, 2017
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
Assets | (Millions of dollars)
Current assets |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 37.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 37.2 |
Accounts receivable, net | — |  |  | — |  |  | — |  |  | 1,203.0 |  |  | — |  |  | 1,203.0 |
Materials and supplies | — |  |  | — |  |  | — |  |  | 90.3 |  |  | — |  |  | 90.3 |
Natural gas and natural gas liquids in storage | — |  |  | — |  |  | — |  |  | 342.3 |  |  | — |  |  | 342.3 |
Other current assets | 9.8 |  |  | 1.3 |  |  | — |  |  | 80.6 |  |  | — |  |  | 91.7 |
Total current assets | 47.0 |  |  | 1.3 |  |  | — |  |  | 1,716.2 |  |  | — |  |  | 1,764.5 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 128.3 |  |  | — |  |  | — |  |  | 15,431.3 |  |  | — |  |  | 15,559.6 |
Accumulated depreciation and amortization | 86.4 |  |  | — |  |  | — |  |  | 2,775.1 |  |  | — |  |  | 2,861.5 |
Net property, plant and equipment | 41.9 |  |  | — |  |  | — |  |  | 12,656.2 |  |  | — |  |  | 12,698.1 |
Investments and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments | 5,752.1 |  |  | 3,133.7 |  |  | 8,058.4 |  |  | 803.0 |  |  | (16,744.0 | ) |  | 1,003.2 |
Intercompany notes receivable | 2,926.9 |  |  | 8,627.8 |  |  | 3,703.1 |  |  | — |  |  | (15,257.8 | ) |  | — |
Other assets | 416.9 |  |  | 0.2 |  |  | — |  |  | 1,007.4 |  |  | (44.4 | ) |  | 1,380.1 |
Total investments and other assets | 9,095.9 |  |  | 11,761.7 |  |  | 11,761.5 |  |  | 1,810.4 |  |  | (32,046.2 | ) |  | 2,383.3 |
Total assets | $ | 9,184.8 |  |  | $ | 11,763.0 |  |  | $ | 11,761.5 |  |  | $ | 16,182.8 |  |  | $ | (32,046.2 | ) |  | $ | 16,845.9 |
Liabilities and equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt | $ | — |  |  | $ | 425.0 |  |  | $ | — |  |  | $ | 7.7 |  |  | $ | — |  |  | $ | 432.7 |
Short-term borrowings | 614.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 614.7 |
Accounts payable | 12.0 |  |  | — |  |  | — |  |  | 1,128.6 |  |  | — |  |  | 1,140.6 |
Other current liabilities | 65.9 |  |  | 85.0 |  |  | — |  |  | 328.4 |  |  | — |  |  | 479.3 |
Total current liabilities | 692.6 |  |  | 510.0 |  |  | — |  |  | 1,464.7 |  |  | — |  |  | 2,667.3 |
Intercompany debt | — |  |  | — |  |  | 8,627.8 |  |  | 6,630.0 |  |  | (15,257.8 | ) |  | — |
Long-term debt, excluding current maturities | 2,726.4 |  |  | 5,336.4 |  |  | — |  |  | 28.8 |  |  | — |  |  | 8,091.6 |
Deferred credits and other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | — |  |  | — |  |  | — |  |  | 97.1 |  |  | (44.4 | ) |  | 52.7 |
Other deferred credits | 237.9 |  |  | — |  |  | — |  |  | 111.0 |  |  | — |  |  | 348.9 |
Total deferred credits and other liabilities | 237.9 |  |  | — |  |  | — |  |  | 208.1 |  |  | (44.4 | ) |  | 401.6 |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 5,527.9 |  |  | 5,916.6 |  |  | 3,133.7 |  |  | 7,693.7 |  |  | (16,744.0 | ) |  | 5,527.9 |
Noncontrolling interests in consolidated subsidiaries | — |  |  | — |  |  | — |  |  | 157.5 |  |  | — |  |  | 157.5 |
Total equity | 5,527.9 |  |  | 5,916.6 |  |  | 3,133.7 |  |  | 7,851.2 |  |  | (16,744.0 | ) |  | 5,685.4 |
Total liabilities and equity | $ | 9,184.8 |  |  | $ | 11,763.0 |  |  | $ | 11,761.5 |  |  | $ | 16,182.8 |  |  | $ | (32,046.2 | ) |  | $ | 16,845.9 |
Condensed Consolidating Statements of Cash Flows | Condensed Consolidating Statements of Cash Flows
| Nine Months Ended September 30, 2018
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Operating activities |  |  |  |  |  |  |  |  |  |  |
Cash provided by operating activities | $ | 964.4 |  |  | $ | 993.8 |  |  | $ | 48.9 |  |  | $ | 1,507.4 |  |  | $ | (1,998.0 | ) |  | $ | 1,516.5 |
Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | (15.0 | ) |  | — |  |  | — |  |  | (1,294.7 | ) |  | — |  |  | (1,309.7 | )
Cash paid for acquisition | (195.0 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (195.0 | )
Contributions to unconsolidated affiliates | — |  |  | — |  |  | (0.5 | ) |  | (0.3 | ) |  | — |  |  | (0.8 | )
Other investing activities | — |  |  | — |  |  | 10.8 |  |  | 9.9 |  |  | — |  |  | 20.7 |
Cash provided by (used in) investing activities | (210.0 | ) |  | — |  |  | 10.3 |  |  | (1,285.1 | ) |  | — |  |  | (1,484.8 | )
Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | (983.1 | ) |  | (999.0 | ) |  | (999.0 | ) |  | — |  |  | 1,998.0 |  |  | (983.1 | )
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | (3.5 | ) |  | — |  |  | (3.5 | )
Intercompany borrowings (advances), net | (1,640.5 | ) |  | 930.2 |  |  | 939.8 |  |  | (229.5 | ) |  | — |  |  | — |
Borrowing (repayment) of short-term borrowings, net | (494.7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (494.7 | )
Issuance of long-term debt, net of discounts | 1,245.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,245.8 |
Repayment of long-term debt | — |  |  | (925.0 | ) |  | — |  |  | (5.7 | ) |  | — |  |  | (930.7 | )
Issuance of common stock | 1,195.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,195.1 |
Other, net | (29.7 | ) |  | — |  |  | — |  |  | 16.4 |  |  | — |  |  | (13.3 | )
Cash provided by (used in) financing activities | (707.1 | ) |  | (993.8 | ) |  | (59.2 | ) | — |  | (222.3 | ) |  | 1,998.0 |  |  | 15.6 |
Change in cash and cash equivalents | 47.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 47.3 |
Cash and cash equivalents at beginning of period | 37.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 37.2 |
Cash and cash equivalents at end of period | $ | 84.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 84.5 |
| Nine Months Ended September 30, 2017
(Unaudited) | Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Operating activities |  |  |  |  |  |  |  |  |  |  |
Cash provided by operating activities | $ | 620.8 |  |  | $ | 994.3 |  |  | $ | 42.1 |  |  | $ | 1,005.8 |  |  | $ | (1,727.0 | ) |  | $ | 936.0 |
Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | (0.5 | ) |  | — |  |  | — |  |  | (329.9 | ) |  | — |  |  | (330.4 | )
Contributions to unconsolidated affiliates | — |  |  | — |  |  | (83.0 | ) |  | (4.7 | ) |  | — |  |  | (87.7 | )
Other investing activities | — |  |  | — |  |  | 11.2 |  |  | 12.3 |  |  | — |  |  | 23.5 |
Cash used in investing activities | (0.5 | ) |  | — |  |  | (71.8 | ) |  | (322.3 | ) |  | — |  |  | (394.6 | )
Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | (543.4 | ) |  | (999.0 | ) |  | (999.0 | ) |  | — |  |  | 1,998.0 |  |  | (543.4 | )
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | (4.1 | ) |  | (271.0 | ) |  | (275.1 | )
Intercompany borrowings (advances), net | (2,376.9 | ) |  | 2,022.2 |  |  | 1,028.3 |  |  | (673.6 | ) |  | — |  |  | — |
Borrowing (repayment) of short-term borrowings, net | 932.3 |  |  | (1,110.3 | ) |  | — |  |  | — |  |  | — |  |  | (178.0 | )
Issuance of long-term debt, net of discounts | 1,190.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,190.1 |
Repayment of long-term debt | (87.1 | ) |  | (900.0 | ) |  | — |  |  | (5.8 | ) |  | — |  |  | (992.9 | )
Issuance of common stock | 45.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 45.8 |
Other, net | (17.9 | ) |  | (7.2 | ) |  | — |  |  | — |  |  | — |  |  | (25.1 | )
Cash provided by (used in) financing activities | (857.1 | ) |  | (994.3 | ) |  | 29.3 |  |  | (683.5 | ) |  | 1,727.0 |  |  | (778.6 | )
Change in cash and cash equivalents | (236.8 | ) |  | — |  |  | (0.4 | ) |  | — |  |  | — |  |  | (237.2 | )
Cash and cash equivalents at beginning of period | 248.5 |  |  | — |  |  | 0.4 |  |  | — |  |  | — |  |  | 248.9 |
Cash and cash equivalents at end of period | $ | 11.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 11.7 |

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