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Accumulated Other Comprehensive Income - Components of Comprehensive Income (Loss), After-tax (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 2,672,500,000 | $ 3,451,600,000 | $ 3,655,800,000
Ending Balance | 981,300,000 | 2,672,500,000 | 3,451,600,000
Operating costs and expenses (exclusive of items shown separately below) | 2,524,900,000 | 3,536,600,000 | 4,071,400,000
Foreign Currency Translation Adjustment |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (4,300,000) | (4,500,000) | 1,400,000
Current period change | 6,100,000 | 200,000 | (5,900,000)
Reclassification from other comprehensive income to earnings | 0 | 0 |
Ending Balance | 1,800,000 | (4,300,000) | (4,500,000)
Prior Service Credit (Cost) Associated with Postretirement Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 35,900,000 | 44,600,000 | 0
Current period change | 185,400,000 | 0 | 44,600,000
Reclassification from other comprehensive income to earnings | (17,300,000) | (8,700,000) |
Ending Balance | 204,000,000.0 | 35,900,000 | 44,600,000
Prior Service Credit (Cost) Associated with Postretirement Plans | Reclassification out of Accumulated Other Comprehensive Income | Postretirement health care and life insurance benefits |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Operating costs and expenses (exclusive of items shown separately below) | 17,300,000 | 8,700,000 |
Total Accumulated Other Comprehensive Income |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 31,600,000 | 40,100,000 | 1,400,000
Current period change | 191,500,000 | 200,000 | 38,700,000
Reclassification from other comprehensive income to earnings | (17,300,000) | (8,700,000) | 0
Ending Balance | $ 205,800,000 | $ 31,600,000 | $ 40,100,000

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