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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ 692.5 |  | $ 732.4 |  | $ 733.9
Other comprehensive income (loss), net of tax |  | 6.9 |  | 15.0 |  | 19.9
Ending balance |  | 631.2 |  | 692.5 |  | 732.4
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (21.4) |  | (19.8) |  | (33.2)
Less: income tax (expense) benefit | [1] | (1.2) |  | (0.9) |  | (1.2)
Net loss (gain) reclassified from AOCI to Net (loss) income |  | 3.7 |  | 3.0 |  | 3.9
Translation impact on Canadian pension plan AOCI balance |  |  |  |  |  | (0.1)
Other comprehensive income (loss), net of tax |  | 24.2 |  | (1.6) |  | 13.4
Ending balance |  | 2.8 |  | (21.4) |  | (19.8)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Unrealized gain (loss) on securities |  | 27.0 |  | 8.0 |  | 0.4
Less: income tax benefit (expense) |  | (6.5) |  | (1.9) |  | (0.1)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | 20.5 |  | 6.1 |  | 0.3
Reclassification from AOCI | [2] |  |  | 0.4 |  | 0.4
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Unrealized gain (loss) on securities |  |  |  | (14.0) |  | 12.3
Less: income tax benefit (expense) |  |  |  | 3.3 |  | (3.0)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  |  |  | (10.7) |  | 9.3
Reclassification from AOCI | [2] | 4.9 |  | 3.5 |  | 4.7
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 17.7 | [3] | 1.1 | [3] | (5.6)
Unrealized gain (loss) on securities |  | (12.2) |  | 63.6 |  | (9.4)
Less: income tax benefit (expense) |  | 2.9 |  | (15.0) |  | 2.3
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | (9.3) |  | 48.6 |  | (7.1)
Reclassification from AOCI |  | (10.5) |  | (41.9) |  | 17.4
Reclassification due to forecasted transactions no longer probable of occurring |  |  |  |  |  | 0.8
Less: income tax (expense) benefit | [1] | 2.5 |  | 9.9 |  | (4.4)
Net loss (gain) reclassified from AOCI to Net (loss) income |  | (8.0) |  | (32.0) |  | 13.8
Other comprehensive income (loss), net of tax |  | (17.3) |  | 16.6 |  | 6.7
Ending balance | [3] | 0.4 |  | 17.7 |  | 1.1
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 0.3
Unrealized gain (loss) on securities |  |  |  |  |  | 1.3
Less: income tax benefit (expense) |  |  |  |  |  | (0.7)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  |  |  |  |  | 0.6
Reclassification from AOCI | [4] |  |  |  |  | (2.0)
Less: income tax (expense) benefit | [1] |  |  |  |  | 1.1
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  |  |  |  | (0.9)
Other comprehensive income (loss), net of tax |  |  |  |  |  | (0.3)
AOCI, Excluded Component of Derivative Qualifying as Fair Value Hedge Attributable to Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Unrealized gain (loss) on securities |  |  |  |  |  | (1.0)
Less: income tax benefit (expense) |  |  |  |  |  | 0.2
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  |  |  |  |  | (0.8)
Reclassification from AOCI |  |  |  |  |  | 0.4
Reclassification due to cancellation of firm commitment |  |  |  |  |  | 0.6
Less: income tax (expense) benefit | [1] |  |  |  |  | (0.2)
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  |  |  |  | 0.8
AOCI, Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  |  |  | (0.1)
Other comprehensive income (loss), net of tax |  |  |  |  |  | 0.1
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (3.7) |  | (18.7) |  | (38.6)
Other comprehensive income (loss), net of tax |  | 6.9 |  | 15.0 |  | 19.9
Ending balance |  | $ 3.2 |  | $ (3.7) |  | $ (18.7)
[1] | Income tax amounts reclassified out of AOCI were included as a component of Income tax benefit (provision).
[2] | Amounts amortized out of AOCI related to pension and other postretirement benefits were included within Net periodic postretirement benefit cost (see Note 5).
[3] | As of December 31, 2022, we estimate a net mark-to-market loss before tax of $1.7 million in AOCI will be reclassified into Net (loss) income upon settlement within the next 12 months.
[4] | Amounts reclassi fied out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.

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