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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) | $ (60.0) | $ (48.8) |
Beginning balance | 1,128.7 | 1,208.3 | $ 651.1
Other comprehensive income (loss) before reclassifications, net of taxes | (14.6) | 1.3 | (3.9)
Amounts reclassified from accumulated other comprehensive loss, net of taxes | 3.4 | 1.8 | 3.4
Ending balance | 1,096.1 | 1,128.7 | 1,208.3
Other comprehensive income (loss) before reclassifications, tax | 0.0 | 0.0 | 0.0
Reclassification from AOCI, Current Period, Tax | 0.0 | 0.0 | 0.0
Impact of adoption of new accounting standards |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (4.1) |  | (1.4)
Ending balance |  | (4.1) |
Accumulated Other Compre- hensive Income (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (48.8) | (51.9) | (42.3)
Impact of adoption of ASU 2018-02 |  |  | (9.1)
Ending balance | (60.0) | (48.8) | (51.9)
Accumulated Other Compre- hensive Income (Loss) | Impact of adoption of new accounting standards |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0.0 |  | (9.1)
Ending balance |  | 0.0 |
Employee Benefit Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (48.0) | (55.2) | (44.2)
Other comprehensive income (loss) before reclassifications, net of taxes | (7.7) | 5.3 | (4.9)
Amounts reclassified from accumulated other comprehensive loss, net of taxes | 2.4 | 1.9 | 3.4
Impact of adoption of ASU 2018-02 |  |  | (9.5)
Ending balance | (53.3) | (48.0) | (55.2)
Employee Benefit Plans | Pension Benefits |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) | (53.3) | (48.0) |
Employee Benefit Plans | Qualified Plans | Pension Benefits |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) | (48.9) | (47.4) |
Employee Benefit Plans | Qualified Plans | Post-retirement plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) | (3.6) | 0.2 |
Employee Benefit Plans | Non-qualified Plan | Pension Benefits |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) | (0.8) | (0.8) |
Interest Rate Swap |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) | (6.7) | (0.8) |
Beginning balance | (0.8) | 3.3 | 1.9
Other comprehensive income (loss) before reclassifications, net of taxes | (6.9) | (4.0) | 1.0
Amounts reclassified from accumulated other comprehensive loss, net of taxes | 1.0 | (0.1) | 0.0
Impact of adoption of ASU 2018-02 |  |  | 0.4
Ending balance | $ (6.7) | $ (0.8) | $ 3.3

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