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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Consolidating Statements of Income |
| Year Ended December 31, 2018
| Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 11,395.6 |  |  | $ | — |  |  | $ | 11,395.6 |
Services | — |  |  | — |  |  | — |  |  | 1,199.7 |  |  | (2.1 | ) |  | 1,197.6 |
Total revenues | — |  |  | — |  |  | — |  |  | 12,595.3 |  |  | (2.1 | ) |  | 12,593.2 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 9,422.7 |  |  | — |  |  | 9,422.7 |
Operating expenses | (0.6 | ) |  | — |  |  | — |  |  | 1,338.3 |  |  | (2.1 | ) |  | 1,335.6 |
Gain on sale of assets | — |  |  | — |  |  | — |  |  | (0.6 | ) |  | — |  |  | (0.6 | )
Operating income | 0.6 |  |  | — |  |  | — |  |  | 1,834.9 |  |  | — |  |  | 1,835.5 |
Equity in net earnings from investments | 1,655.6 |  |  | 1,660.5 |  |  | 1,660.5 |  |  | 116.3 |  |  | (4,934.5 | ) |  | 158.4 |
Other income (expense), net | 29.6 |  |  | 315.1 |  |  | 315.1 |  |  | (36.0 | ) |  | (630.2 | ) |  | (6.4 | )
Interest expense, net | (179.4 | ) |  | (315.1 | ) |  | (315.1 | ) |  | (290.2 | ) |  | 630.2 |  |  | (469.6 | )
Income before income taxes | 1,506.4 |  |  | 1,660.5 |  |  | 1,660.5 |  |  | 1,625.0 |  |  | (4,934.5 | ) |  | 1,517.9 |
Income taxes | (354.7 | ) |  | — |  |  | — |  |  | (8.2 | ) |  | — |  |  | (362.9 | )
Net income | 1,151.7 |  |  | 1,660.5 |  |  | 1,660.5 |  |  | 1,616.8 |  |  | (4,934.5 | ) |  | 1,155.0 |
Less: Net income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 3.3 |  |  | — |  |  | 3.3 |
Net income attributable to ONEOK | 1,151.7 |  |  | 1,660.5 |  |  | 1,660.5 |  |  | 1,613.5 |  |  | (4,934.5 | ) |  | 1,151.7 |
Less: Preferred stock dividends | 1.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1.1 |
Net income available to common shareholders | $ | 1,150.6 |  |  | $ | 1,660.5 |  |  | $ | 1,660.5 |  |  | $ | 1,613.5 |  |  | $ | (4,934.5 | ) |  | $ | 1,150.6 |
| Year Ending December 31, 2017
| Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9,862.7 |  |  | $ | — |  |  | $ | 9,862.7 |
Services | — |  |  | — |  |  | — |  |  | 2,313.2 |  |  | (2.0 | ) |  | 2,311.2 |
Total revenues | — |  |  | — |  |  | — |  |  | 12,175.9 |  |  | (2.0 | ) |  | 12,173.9 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 9,538.0 |  |  | — |  |  | 9,538.0 |
Operating expenses | 17.8 |  |  | — |  |  | 9.2 |  |  | 1,204.0 |  |  | (2.0 | ) |  | 1,229.0 |
Impairment of long-lived assets | — |  |  | — |  |  | — |  |  | 16.0 |  |  | — |  |  | 16.0 |
Gain on sale of assets | — |  |  | — |  |  | — |  |  | (0.9 | ) |  | — |  |  | (0.9 | )
Operating income | (17.8 | ) |  | — |  |  | (9.2 | ) |  | 1,418.8 |  |  | — |  |  | 1,391.8 |
Equity in net earnings from investments | 1,236.6 |  |  | 1,215.7 |  |  | 1,224.9 |  |  | 100.7 |  |  | (3,618.6 | ) |  | 159.3 |
Impairment of equity investments | — |  |  | — |  |  | — |  |  | (4.3 | ) |  | — |  |  | (4.3 | )
Other income (expense), net | (12.3 | ) |  | 353.1 |  |  | 353.1 |  |  | (8.0 | ) |  | (706.2 | ) |  | (20.3 | )
Interest expense, net | (137.1 | ) |  | (353.1 | ) |  | (353.1 | ) |  | (348.6 | ) |  | 706.2 |  |  | (485.7 | )
Income before income taxes | 1,069.4 |  |  | 1,215.7 |  |  | 1,215.7 |  | — |  | 1,158.6 |  |  | (3,618.6 | ) |  | 1,040.8 |
Income taxes | (480.2 | ) |  | — |  |  | — |  |  | 32.9 |  |  | — |  |  | (447.3 | )
Net income | 589.2 |  |  | 1,215.7 |  |  | 1,215.7 |  |  | 1,191.5 |  |  | (3,618.6 | ) |  | 593.5 |
Less: Net income attributable to noncontrolling interests | 201.4 |  |  | — |  |  | — |  |  | 4.3 |  |  | — |  |  | 205.7 |
Net income attributable to ONEOK | 387.8 |  |  | 1,215.7 |  |  | 1,215.7 |  |  | 1,187.2 |  |  | (3,618.6 | ) |  | 387.8 |
Less: Preferred stock dividends | 0.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.8 |
Net income available to common shareholders | $ | 387.0 |  |  | $ | 1,215.7 |  |  | $ | 1,215.7 |  |  | $ | 1,187.2 |  |  | $ | (3,618.6 | ) |  | $ | 387.0 |
| Year Ending December 31, 2016
| Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Revenues |  |  |  |  |  |  |  |  |  |  |
Commodity sales | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 6,858.5 |  |  | $ | — |  |  | $ | 6,858.5 |
Services | — |  |  | — |  |  | — |  |  | 2,064.3 |  |  | (1.8 | ) |  | 2,062.5 |
Total revenues | — |  |  | — |  |  | — |  |  | 8,922.8 |  |  | (1.8 | ) |  | 8,921.0 |
Cost of sales and fuel (exclusive of items shown separately below) | — |  |  | — |  |  | — |  |  | 6,496.1 |  |  | — |  |  | 6,496.1 |
Operating expenses | 18.7 |  |  | — |  |  | — |  |  | 1,121.8 |  |  | (1.8 | ) |  | 1,138.7 |
(Gain) loss on sale of assets | 0.3 |  |  | — |  |  | — |  |  | (9.9 | ) |  | — |  |  | (9.6 | )
Operating income | (19.0 | ) |  | — |  |  | — |  |  | 1,314.8 |  |  | — |  |  | 1,295.8 |
Equity in net earnings from investments | 1,063.9 |  |  | 1,066.8 |  |  | 1,066.8 |  |  | 69.7 |  |  | (3,127.5 | ) |  | 139.7 |
Other income (expense), net | (5.0 | ) |  | 373.5 |  |  | 373.5 |  |  | (2.8 | ) |  | (747.0 | ) |  | (7.8 | )
Interest expense, net | (102.9 | ) |  | (373.5 | ) |  | (373.5 | ) |  | (366.8 | ) |  | 747.0 |  |  | (469.7 | )
Income before income taxes | 937.0 |  |  | 1,066.8 |  |  | 1,066.8 |  |  | 1,014.9 |  |  | (3,127.5 | ) |  | 958.0 |
Income taxes | (199.0 | ) |  | — |  |  | — |  |  | (13.4 | ) |  | — |  |  | (212.4 | )
Income from continuing operations | 738.0 |  |  | 1,066.8 |  |  | 1,066.8 |  |  | 1,001.5 |  |  | (3,127.5 | ) |  | 745.6 |
Income (loss) from discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | (2.1 | ) |  | — |  |  | (2.1 | )
Net income | 738.0 |  |  | 1,066.8 |  |  | 1,066.8 |  |  | 999.4 |  |  | (3,127.5 | ) |  | 743.5 |
Less: Net income attributable to noncontrolling interests | 386.0 |  |  | — |  |  | — |  |  | 5.5 |  |  | — |  |  | 391.5 |
Net income attributable to ONEOK | $ | 352.0 |  |  | $ | 1,066.8 |  |  | $ | 1,066.8 |  |  | $ | 993.9 |  |  | $ | (3,127.5 | ) |  | $ | 352.0 |
Condensed Consolidating Statements of Comprehensive Income |
| Year Ended December 31, 2018
| Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 1,151.7 |  |  | $ | 1,660.5 |  |  | $ | 1,660.5 |  |  | $ | 1,616.8 |  |  | $ | (4,934.5 | ) |  | $ | 1,155.0 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | (46.7 | ) |  | 53.2 |  |  | 53.2 |  |  | 41.0 |  |  | (106.4 | ) |  | (5.7 | )
Realized (gains) losses on derivatives recognized in net income, net of tax | 1.9 |  |  | 45.5 |  |  | 29.6 |  |  | 19.1 |  |  | (59.2 | ) |  | 36.9 |
Change in pension and postretirement benefit plan liability, net of tax | 5.3 |  |  | (0.7 | ) |  | — |  |  | 0.2 |  |  | — |  |  | 4.8 |
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | 3.1 |  |  | 3.1 |  |  | 2.3 |  |  | (6.1 | ) |  | 2.4 |
Total other comprehensive income (loss), net of tax | (39.5 | ) |  | 101.1 |  |  | 85.9 |  |  | 62.6 |  |  | (171.7 | ) |  | 38.4 |
Comprehensive income | 1,112.2 |  |  | 1,761.6 |  |  | 1,746.4 |  |  | 1,679.4 |  |  | (5,106.2 | ) |  | 1,193.4 |
Less: Comprehensive income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | 3.3 |  |  | — |  |  | 3.3 |
Comprehensive income attributable to ONEOK | $ | 1,112.2 |  |  | $ | 1,761.6 |  |  | $ | 1,746.4 |  |  | $ | 1,676.1 |  |  | $ | (5,106.2 | ) |  | $ | 1,190.1 |
| Year Ending December 31, 2017
| Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 589.2 |  |  | $ | 1,215.7 |  |  | $ | 1,215.7 |  |  | $ | 1,191.5 |  |  | $ | (3,618.6 | ) |  | $ | 593.5 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 19.1 |  |  | (72.2 | ) |  | (40.6 | ) |  | (8.8 | ) |  | 81.1 |  |  | (21.4 | )
Realized (gains) losses on derivatives recognized in net income, net of tax | 2.5 |  |  | 86.5 |  |  | 69.6 |  |  | 44.3 |  |  | (139.2 | ) |  | 63.7 |
Change in pension and postretirement benefit plan liability, net of tax | (4.2 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (4.2 | )
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | (1.1 | ) |  | (1.1 | ) |  | (1.0 | ) |  | 2.2 |  |  | (1.0 | )
Total other comprehensive income (loss), net of tax | 17.4 |  |  | 13.2 |  |  | 27.9 |  |  | 34.5 |  |  | (55.9 | ) |  | 37.1 |
Comprehensive income | 606.6 |  |  | 1,228.9 |  |  | 1,243.6 |  |  | 1,226.0 |  |  | (3,674.5 | ) |  | 630.6 |
Less: Comprehensive income attributable to noncontrolling interests | 232.4 |  |  | — |  |  | — |  |  | 4.3 |  |  | — |  |  | 236.7 |
Comprehensive income attributable to ONEOK | $ | 374.2 |  |  | $ | 1,228.9 |  |  | $ | 1,243.6 |  |  | $ | 1,221.7 |  |  | $ | (3,674.5 | ) |  | $ | 393.9 |
| Year Ending December 31, 2016
| Parent Issuer & Guarantor |  | Subsidiary Issuer & Guarantor |  | Guarantor Subsidiary |  | Combined Non-Guarantor Subsidiaries |  | Consolidating Entries |  | Total
| (Millions of dollars)
Net income | $ | 738.0 |  |  | $ | 1,066.8 |  |  | $ | 1,066.8 |  |  | $ | 999.4 |  |  | $ | (3,127.5 | ) |  | $ | 743.5 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | — |  |  | (35.8 | ) |  | (78.5 | ) |  | (108.8 | ) |  | 192.8 |  |  | (30.3 | )
Realized (gains) losses on derivatives recognized in net income, net of tax | 2.1 |  |  | (10.7 | ) |  | (26.4 | ) |  | (33.4 | ) |  | 61.4 |  |  | (7.0 | )
Change in pension and postretirement benefit plan liability, net of tax | (16.7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (16.7 | )
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | — |  |  | (1.8 | ) |  | (1.8 | ) |  | (3.3 | ) |  | 5.4 |  |  | (1.5 | )
Total other comprehensive income (loss), net of tax | (14.6 | ) |  | (48.3 | ) |  | (106.7 | ) |  | (145.5 | ) |  | 259.6 |  |  | (55.5 | )
Comprehensive income | 723.4 |  |  | 1,018.5 |  |  | 960.1 |  |  | 853.9 |  |  | (2,867.9 | ) |  | 688.0 |
Less: Comprehensive income attributable to noncontrolling interests | 357.6 |  |  | — |  |  | — |  |  | 5.5 |  |  | — |  |  | 363.1 |
Comprehensive income attributable to ONEOK | $ | 365.8 |  |  | $ | 1,018.5 |  |  | $ | 960.1 |  |  | $ | 848.4 |  |  | $ | (2,867.9 | ) |  | $ | 324.9 |
Condensed Consolidating Balance Sheets |
| December 31, 2018
| 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 | $ | 12.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 12.0 |
Accounts receivable, net | — |  |  | — |  |  | — |  |  | 819.0 |  |  | — |  |  | 819.0 |
Materials and supplies | — |  |  | — |  |  | — |  |  | 141.2 |  |  | — |  |  | 141.2 |
Natural gas and natural gas liquids in storage | — |  |  | — |  |  | — |  |  | 296.7 |  |  | — |  |  | 296.7 |
Other current assets | 29.1 |  |  | — |  |  | — |  |  | 100.6 |  |  | — |  |  | 129.7 |
Total current assets | 41.1 |  |  | — |  |  | — |  |  | 1,357.5 |  |  | — |  |  | 1,398.6 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 145.5 |  |  | — |  |  | — |  |  | 17,885.5 |  |  | — |  |  | 18,031.0 |
Accumulated depreciation and amortization | 92.0 |  |  | — |  |  | — |  |  | 3,172.3 |  |  | — |  |  | 3,264.3 |
Net property, plant and equipment | 53.5 |  |  | — |  |  | — |  |  | 14,713.2 |  |  | — |  |  | 14,766.7 |
Investments and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments | 6,153.5 |  |  | 3,548.1 |  |  | 9,721.6 |  |  | 791.1 |  |  | (19,245.1 | ) |  | 969.2 |
Intercompany notes receivable | 5,308.6 |  |  | 7,701.5 |  |  | 1,528.0 |  |  | — |  |  | (14,538.1 | ) |  | — |
Other assets | 115.9 |  |  | — |  |  | — |  |  | 982.3 |  |  | (1.0 | ) |  | 1,097.2 |
Total investments and other assets | 11,578.0 |  |  | 11,249.6 |  |  | 11,249.6 |  |  | 1,773.4 |  |  | (33,784.2 | ) |  | 2,066.4 |
Total assets | $ | 11,672.6 |  |  | $ | 11,249.6 |  |  | $ | 11,249.6 |  |  | $ | 17,844.1 |  |  | $ | (33,784.2 | ) |  | $ | 18,231.7 |
Liabilities and equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt | $ | — |  |  | $ | 500.0 |  |  | $ | — |  |  | $ | 7.7 |  |  | $ | — |  |  | $ | 507.7 |
Accounts payable | 31.3 |  |  | — |  |  | — |  |  | 1,086.8 |  |  | — |  |  | 1,118.1 |
Other current liabilities | 123.2 |  |  | 81.0 |  |  | — |  |  | 278.4 |  |  | — |  |  | 482.6 |
Total current liabilities | 154.5 |  |  | 581.0 |  |  | — |  |  | 1,372.9 |  |  | — |  |  | 2,108.4 |
Intercompany debt | — |  |  | — |  |  | 7,701.5 |  |  | 6,836.6 |  |  | (14,538.1 | ) |  | — |
Long-term debt, excluding current maturities | 4,510.7 |  |  | 4,341.4 |  |  | — |  |  | 21.2 |  |  | — |  |  | 8,873.3 |
Deferred credits and other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 112.3 |  |  | — |  |  | — |  |  | 108.4 |  |  | (1.0 | ) |  | 219.7 |
Other deferred credits | 315.6 |  |  | — |  |  | — |  |  | 135.2 |  |  | — |  |  | 450.8 |
Total deferred credits and other liabilities | 427.9 |  |  | — |  |  | — |  |  | 243.6 |  |  | (1.0 | ) |  | 670.5 |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | 6,579.5 |  |  | 6,327.2 |  |  | 3,548.1 |  |  | 9,369.8 |  |  | (19,245.1 | ) |  | 6,579.5 |
Total liabilities and equity | $ | 11,672.6 |  |  | $ | 11,249.6 |  |  | $ | 11,249.6 |  |  | $ | 17,844.1 |  |  | $ | (33,784.2 | ) |  | $ | 18,231.7 |
| December 31, 2017
| 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 |
| Year Ended December 31, 2018
| 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 | $ | 1,325.1 |  |  | $ | 1,344.7 |  |  | $ | 67.9 |  |  | $ | 2,113.0 |  |  | $ | (2,664.0 | ) |  | $ | 2,186.7 |
Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | (18.8 | ) |  | — |  |  | — |  |  | (2,122.7 | ) |  | — |  |  | (2,141.5 | )
Other investing activities | — |  |  | — |  |  | 15.3 |  |  | 11.3 |  |  | — |  |  | 26.6 |
Cash used in investing activities | (18.8 | ) |  | — |  |  | 15.3 |  |  | (2,111.4 | ) |  | — |  |  | (2,114.9 | )
Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | (1,335.1 | ) |  | (1,332.0 | ) |  | (1,332.0 | ) |  | — |  |  | 2,664.0 |  |  | (1,335.1 | )
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | (3.5 | ) |  | — |  |  | (3.5 | )
Intercompany borrowings (advances), net | (2,154.4 | ) |  | 912.3 |  |  | 1,248.8 |  |  | (6.7 | ) |  | — |  |  | — |
Repayment of short-term borrowings, net | (614.7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (614.7 | )
Issuance of long-term debt, net of discounts | 1,795.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,795.8 |
Repayment of long-term debt | — |  |  | (925.0 | ) |  | — |  |  | (7.7 | ) |  | — |  |  | (932.7 | )
Issuance of common stock | 1,204.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,204.0 |
Acquisition of noncontrolling interests | (195.0 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (195.0 | )
Other, net | (32.1 | ) |  | — |  |  | — |  |  | 16.3 |  |  | — |  |  | (15.8 | )
Cash used in financing activities | (1,331.5 | ) |  | (1,344.7 | ) |  | (83.2 | ) |  | (1.6 | ) |  | 2,664.0 |  |  | (97.0 | )
Change in cash and cash equivalents | (25.2 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (25.2 | )
Cash and cash equivalents at beginning of period | 37.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 37.2 |
Cash and cash equivalents at end of period | $ | 12.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 12.0 |
| Year Ending December 31, 2017
| 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 | $ | 947.4 |  |  | $ | 1,348.3 |  |  | $ | 59.0 |  |  | $ | 1,353.7 |  |  | $ | (2,393.0 | ) |  | $ | 1,315.4 |
Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | — |  |  | — |  |  | — |  |  | (512.4 | ) |  | — |  |  | (512.4 | )
Contributions to unconsolidated affiliates | — |  |  | — |  |  | (83.0 | ) |  | (4.9 | ) |  | — |  |  | (87.9 | )
Other investing activities | — |  |  | — |  |  | 14.8 |  |  | 17.9 |  |  | — |  |  | 32.7 |
Cash used in investing activities | — |  |  | — |  |  | (68.2 | ) |  | (499.4 | ) |  | — |  |  | (567.6 | )
Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | (829.4 | ) |  | (1,332.0 | ) |  | (1,332.0 | ) |  | — |  |  | 2,664.0 |  |  | (829.4 | )
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | (5.3 | ) |  | (271.0 | ) |  | (276.3 | )
Intercompany borrowings (advances), net | (2,500.7 | ) |  | 2,001.2 |  |  | 1,340.8 |  |  | (841.3 | ) |  | — |  |  | — |
Borrowing (repayment) of short-term borrowings, net | 614.7 |  |  | (1,110.3 | ) |  | — |  |  | — |  |  | — |  |  | (495.6 | )
Issuance of long-term debt, net of discounts | 1,190.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,190.5 |
Repayment of long-term debt | (87.1 | ) |  | (900.0 | ) |  | — |  |  | (7.7 | ) |  | — |  |  | (994.8 | )
Issuance of common stock | 471.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 471.4 |
Other, net | (18.1 | ) |  | (7.2 | ) |  | — |  |  | — |  |  | — |  |  | (25.3 | )
Cash provided by (used in) financing activities | (1,158.7 | ) |  | (1,348.3 | ) |  | 8.8 |  |  | (854.3 | ) |  | 2,393.0 |  |  | (959.5 | )
Change in cash and cash equivalents | (211.3 | ) |  | — |  |  | (0.4 | ) |  | — |  |  | — |  |  | (211.7 | )
Cash and cash equivalents at beginning of period | 248.5 |  |  | — |  |  | 0.4 |  |  | — |  |  | — |  |  | 248.9 |
Cash and cash equivalents at end of period | $ | 37.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 37.2 |
| Year Ending December 31, 2016
| 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 | $ | 717.0 |  |  | $ | 1,334.5 |  |  | $ | 70.0 |  |  | $ | 1,353.9 |  |  | $ | (2,122.1 | ) |  | $ | 1,353.3 |
Investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | (0.2 | ) |  | — |  |  | — |  |  | (624.4 | ) |  | — |  |  | (624.6 | )
Other investing activities | — |  |  | — |  |  | 34.9 |  |  | (25.7 | ) |  | — |  |  | 9.2 |
Cash provided by (used in) investing activities | (0.2 | ) |  | — |  |  | 34.9 |  |  | (650.1 | ) |  | — |  |  | (615.4 | )
Financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid | (517.6 | ) |  | (1,332.0 | ) |  | (1,332.0 | ) |  | — |  |  | 2,664.0 |  |  | (517.6 | )
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | (7.5 | ) |  | (541.9 | ) |  | (549.4 | )
Intercompany borrowings (advances), net | (63.1 | ) |  | (470.8 | ) |  | 1,222.4 |  |  | (688.5 | ) |  | — |  |  | — |
Borrowing of short-term borrowings, net | — |  |  | 563.9 |  |  | — |  |  | — |  |  | — |  |  | 563.9 |
Issuance of long-term debt, net of discounts | — |  |  | 1,000.0 |  |  | — |  |  | — |  |  | — |  |  | 1,000.0 |
Debt financing costs | — |  |  | (2.8 | ) |  | — |  |  | — |  |  | — |  |  | (2.8 | )
Repayment of long-term debt | (0.3 | ) |  | (1,100.0 | ) |  | — |  |  | (7.7 | ) |  | — |  |  | (1,108.0 | )
Issuance of common stock | 22.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 22.0 |
Other, net | (1.7 | ) |  | 7.2 |  |  | — |  |  | (0.1 | ) |  | — |  |  | 5.4 |
Cash used in financing activities | (560.7 | ) |  | (1,334.5 | ) |  | (109.6 | ) |  | (703.8 | ) |  | 2,122.1 |  |  | (586.5 | )
Change in cash and cash equivalents | 156.1 |  |  | — |  |  | (4.7 | ) |  | — |  |  | — |  |  | 151.4 |
Change in cash and cash equivalents included in discontinued operations | (0.1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.1 | )
Change in cash and cash equivalents included in continuing operations | 156.0 |  |  | — |  |  | (4.7 | ) |  | — |  |  | — |  |  | 151.3 |
Cash and cash equivalents at beginning of period | 92.5 |  |  | — |  |  | 5.1 |  |  | — |  |  | — |  |  | 97.6 |
Cash and cash equivalents at end of period | $ | 248.5 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 248.9 |

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