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Accumulated Other Comprehensive (Loss) Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 708.2 |  | $ 692.5 | $ 735.0 |  | $ 732.4 | $ 692.5 |  | $ 732.4 |
Other comprehensive (loss) income, net of tax |  | (35.6) |  | 18.0 | 15.9 |  | 9.1 | (17.6) |  | 25.0 |
Ending balance |  | 650.0 |  | 708.2 | 720.7 |  | 735.0 | 650.0 |  | 720.7 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (20.5) |  | (21.4) | (19.1) |  | (19.8) | (21.4) |  | (19.8) |
Less: income tax benefit (expense) |  | (0.4) |  |  | (0.2) |  |  | (0.7) |  | (0.5) |
Other comprehensive (loss) income, net of tax |  | 0.9 |  |  | 0.7 |  |  | 1.8 |  | 1.4 |
Ending balance |  | (19.6) |  | (20.5) | (18.4) |  | (19.1) | (19.6) |  | (18.4) |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI | [1] |  |  |  | 0.1 |  |  |  |  | 0.2 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI | [1] | 1.3 |  |  | 0.8 |  |  | 2.5 |  | 1.7 |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 34.8 |  | 17.7 | 9.6 |  | 1.1 | 17.7 |  | 1.1 |
Unrealized gain on securities |  | (50.7) |  |  | 28.4 |  |  | (8.4) |  | 42.3 |
Less: income tax expense |  | 12.0 |  |  | (6.7) |  |  | 2.0 |  | (10.0) |
Net unrealized gain on available for sale securities, cash flow hedges and fair value hedges |  | (38.7) |  |  | 21.7 |  |  | (6.4) |  | 32.3 |
Reclassification from AOCI |  | 2.9 |  |  | (8.7) |  |  | (17.0) |  | (11.4) |
Less: income tax benefit (expense) | [2] | (0.7) |  |  | 2.2 |  |  | 4.0 |  | 2.8 |
Net loss (gain) reclassified from AOCI to Net loss |  | 2.2 |  |  | (6.5) |  |  | (13.0) |  | (8.6) |
Other comprehensive (loss) income, net of tax |  | (36.5) |  |  | 15.2 |  |  | (19.4) |  | 23.7 |
Ending balance |  | (1.7) | [3] | 34.8 | 24.8 | [3] | 9.6 | (1.7) | [3] | 24.8 | [3]
AOCI, Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | (0.1) |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  |  | (0.1) |
Ending balance |  |  |  |  | (0.1) |  | (0.1) |  |  | (0.1) |
AOCI Attributable to Parent |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 14.3 |  | (3.7) | (9.6) |  | (18.7) | (3.7) |  | (18.7) |
Other comprehensive (loss) income, net of tax |  | (35.6) |  | 18.0 | 15.9 |  | 9.1 |  |  |  |
Ending balance |  | $ (21.3) |  | $ 14.3 | $ 6.3 |  | $ (9.6) | $ (21.3) |  | $ 6.3 |
[1] | Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other expense, net, as a component of Net periodic postretirement benefit cost relating to Salaried VEBA
[2] | Income tax amounts reclassified out of AOCI were included as a component of Income tax benefit.
[3] | As of June 30, 2022, we estimate a net mark-to-market loss before tax of $6.0 million in AOCI will be reclassified into Net loss upon settlement within the next 12 months.

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