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Guarantor Subsidiaries (Consolidating Statement of Cash Flow) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Operating Activities |  |  |  |  |  |  |
Net income | $ 168.9 | $ 89.3 | $ 32.7 | $ 5.3 | $ 258.2 | $ 38.0 |
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities |  |  |  |  |  |  |
Depreciation and amortization | 39.5 |  | 36.5 |  | 78.9 | 76.2 |
Deferred and noncurrent income tax charges (credits) |  |  |  |  | 9.4 | 2.7 |
Accretion of asset retirement obligations | 0.5 |  | 0.5 |  | 1.1 | 1.0 | $ 2.1
(Gain) loss on sale of assets | (1.3) |  | 0.0 |  | (1.4) | 0.1 |
Net (increase) decrease in noncash operating working capital |  |  |  |  | 23.2 | (0.5) |
Equity in earnings of affiliates | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Other operating activities - net |  |  |  |  | 12.5 | 7.4 |
Net cash provided by (required by) operating activities |  |  |  |  | 381.9 | 124.9 |
Investing Activities |  |  |  |  |  |  |
Property additions |  |  |  |  | (105.7) | (86.6) |
Proceeds from sale of assets |  |  |  |  | 7.6 | 1.4 |
Other investing activities - net |  |  |  |  | (1.1) | (0.5) |
Net cash provided by (required by) investing activities |  |  |  |  | (99.2) | (85.7) |
Financing Activities |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (140.6) | (30.1) |
Borrowings of debt |  |  |  |  | 0.0 |  |
Repayments of debt |  |  |  |  | (13.2) | (10.7) |
Amounts related to share-based compensation |  |  |  |  | (5.6) | (4.3) |
Net distributions to parent |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) financing activities |  |  |  |  | (159.4) | (45.1) |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  | 123.3 | (5.9) |
Cash, cash equivalents, and restricted cash at beginning of period |  | 280.3 |  | 184.5 | 280.3 | 184.5 | 184.5
Cash, cash equivalents, and restricted cash at end of period | 403.6 |  | 178.6 |  | 403.6 | 178.6 | 280.3
Eliminations |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |
Net income | (168.7) |  | (32.6) |  | (257.9) | (37.7) |
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities |  |  |  |  |  |  |
Depreciation and amortization | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Deferred and noncurrent income tax charges (credits) |  |  |  |  | 0.0 | 0.0 |
Accretion of asset retirement obligations | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
(Gain) loss on sale of assets | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Net (increase) decrease in noncash operating working capital |  |  |  |  | 0.0 | 0.0 |
Equity in earnings of affiliates | 168.7 |  | 32.6 |  | 257.9 | 37.7 |
Other operating activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) operating activities |  |  |  |  | 0.0 | 0.0 |
Investing Activities |  |  |  |  |  |  |
Property additions |  |  |  |  | 0.0 | 0.0 |
Proceeds from sale of assets |  |  |  |  | 0.0 | 0.0 |
Other investing activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) investing activities |  |  |  |  | 0.0 | 0.0 |
Financing Activities |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | 0.0 | 0.0 |
Borrowings of debt |  |  |  |  | 0.0 |  |
Repayments of debt |  |  |  |  | 0.0 | 0.0 |
Amounts related to share-based compensation |  |  |  |  | 0.0 | 0.0 |
Net distributions to parent |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) financing activities |  |  |  |  | 0.0 | 0.0 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  | 0.0 | 0.0 |
Cash, cash equivalents, and restricted cash at beginning of period |  | 0.0 |  | 0.0 | 0.0 | 0.0 | 0.0
Cash, cash equivalents, and restricted cash at end of period | 0.0 |  | 0.0 |  | 0.0 | 0.0 | 0.0
Parent Company | Reportable Legal Entities |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |
Net income | 168.9 |  | 32.7 |  | 258.2 | 38.0 |
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities |  |  |  |  |  |  |
Depreciation and amortization | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Deferred and noncurrent income tax charges (credits) |  |  |  |  | 0.0 | 0.0 |
Accretion of asset retirement obligations | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
(Gain) loss on sale of assets | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Net (increase) decrease in noncash operating working capital |  |  |  |  | 0.0 | 0.0 |
Equity in earnings of affiliates | (168.9) |  | (32.7) |  | (258.2) | (38.0) |
Other operating activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) operating activities |  |  |  |  | 0.0 | 0.0 |
Investing Activities |  |  |  |  |  |  |
Property additions |  |  |  |  | 0.0 | 0.0 |
Proceeds from sale of assets |  |  |  |  | 0.0 | 0.0 |
Other investing activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) investing activities |  |  |  |  | 0.0 | 0.0 |
Financing Activities |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (140.6) | (30.1) |
Borrowings of debt |  |  |  |  | 0.0 |  |
Repayments of debt |  |  |  |  | 0.0 | 0.0 |
Amounts related to share-based compensation |  |  |  |  | 0.0 | 0.0 |
Net distributions to parent |  |  |  |  | 140.6 | 30.1 |
Net cash provided by (required by) financing activities |  |  |  |  | 0.0 | 0.0 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  | 0.0 | 0.0 |
Cash, cash equivalents, and restricted cash at beginning of period |  | 0.0 |  | 0.0 | 0.0 | 0.0 | 0.0
Cash, cash equivalents, and restricted cash at end of period | 0.0 |  | 0.0 |  | 0.0 | 0.0 | 0.0
Issuer | Reportable Legal Entities |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |
Net income | 168.9 |  | 32.7 |  | 258.2 | 38.0 |
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities |  |  |  |  |  |  |
Depreciation and amortization | 39.4 |  | 36.5 |  | 78.8 | 76.2 |
Deferred and noncurrent income tax charges (credits) |  |  |  |  | 9.4 | 2.7 |
Accretion of asset retirement obligations | 0.5 |  | 0.5 |  | 1.1 | 1.0 |
(Gain) loss on sale of assets | (1.3) |  | 0.0 |  | (1.4) | 0.1 |
Net (increase) decrease in noncash operating working capital |  |  |  |  | 23.0 | (0.4) |
Equity in earnings of affiliates | 0.2 |  | 0.1 |  | 0.3 | 0.3 |
Other operating activities - net |  |  |  |  | 12.5 | 7.4 |
Net cash provided by (required by) operating activities |  |  |  |  | 381.9 | 125.3 |
Investing Activities |  |  |  |  |  |  |
Property additions |  |  |  |  | (102.8) | (83.4) |
Proceeds from sale of assets |  |  |  |  | 7.6 | 1.4 |
Other investing activities - net |  |  |  |  | (1.1) | (0.5) |
Net cash provided by (required by) investing activities |  |  |  |  | (96.3) | (82.5) |
Financing Activities |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | 0.0 | 0.0 |
Borrowings of debt |  |  |  |  | 0.0 |  |
Repayments of debt |  |  |  |  | (13.2) | (10.7) |
Amounts related to share-based compensation |  |  |  |  | (5.6) | (4.3) |
Net distributions to parent |  |  |  |  | (143.2) | (33.8) |
Net cash provided by (required by) financing activities |  |  |  |  | (162.0) | (48.8) |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  | 123.6 | (6.0) |
Cash, cash equivalents, and restricted cash at beginning of period |  | 279.4 |  | 184.0 | 279.4 | 184.0 | 184.0
Cash, cash equivalents, and restricted cash at end of period | 403.0 |  | 178.0 |  | 403.0 | 178.0 | 279.4
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |
Net income | (0.2) |  | (0.1) |  | (0.3) | (0.3) |
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities |  |  |  |  |  |  |
Depreciation and amortization | 0.1 |  | 0.0 |  | 0.1 | 0.0 |
Deferred and noncurrent income tax charges (credits) |  |  |  |  | 0.0 | 0.0 |
Accretion of asset retirement obligations | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
(Gain) loss on sale of assets | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Net (increase) decrease in noncash operating working capital |  |  |  |  | 0.2 | (0.1) |
Equity in earnings of affiliates | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Other operating activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) operating activities |  |  |  |  | 0.0 | (0.4) |
Investing Activities |  |  |  |  |  |  |
Property additions |  |  |  |  | (2.9) | (3.2) |
Proceeds from sale of assets |  |  |  |  | 0.0 | 0.0 |
Other investing activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) investing activities |  |  |  |  | (2.9) | (3.2) |
Financing Activities |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | 0.0 | 0.0 |
Borrowings of debt |  |  |  |  | 0.0 |  |
Repayments of debt |  |  |  |  | 0.0 | 0.0 |
Amounts related to share-based compensation |  |  |  |  | 0.0 | 0.0 |
Net distributions to parent |  |  |  |  | 2.6 | 3.7 |
Net cash provided by (required by) financing activities |  |  |  |  | 2.6 | 3.7 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  | (0.3) | 0.1 |
Cash, cash equivalents, and restricted cash at beginning of period |  | 0.9 |  | 0.5 | 0.9 | 0.5 | 0.5
Cash, cash equivalents, and restricted cash at end of period | 0.6 |  | 0.6 |  | 0.6 | 0.6 | 0.9
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |
Net income | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities |  |  |  |  |  |  |
Depreciation and amortization | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Deferred and noncurrent income tax charges (credits) |  |  |  |  | 0.0 | 0.0 |
Accretion of asset retirement obligations | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
(Gain) loss on sale of assets | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Net (increase) decrease in noncash operating working capital |  |  |  |  | 0.0 | 0.0 |
Equity in earnings of affiliates | 0.0 |  | 0.0 |  | 0.0 | 0.0 |
Other operating activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) operating activities |  |  |  |  | 0.0 | 0.0 |
Investing Activities |  |  |  |  |  |  |
Property additions |  |  |  |  | 0.0 | 0.0 |
Proceeds from sale of assets |  |  |  |  | 0.0 | 0.0 |
Other investing activities - net |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) investing activities |  |  |  |  | 0.0 | 0.0 |
Financing Activities |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | 0.0 | 0.0 |
Borrowings of debt |  |  |  |  | 0.0 |  |
Repayments of debt |  |  |  |  | 0.0 | 0.0 |
Amounts related to share-based compensation |  |  |  |  | 0.0 | 0.0 |
Net distributions to parent |  |  |  |  | 0.0 | 0.0 |
Net cash provided by (required by) financing activities |  |  |  |  | 0.0 | 0.0 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  | 0.0 | 0.0 |
Cash, cash equivalents, and restricted cash at beginning of period |  | $ 0.0 |  | $ 0.0 | 0.0 | 0.0 | 0.0
Cash, cash equivalents, and restricted cash at end of period | $ 0.0 |  | $ 0.0 |  | $ 0.0 | $ 0.0 | $ 0.0

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