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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 720.7 | $ 735.0 | $ 732.4 | $ 718.8 | $ 721.1 | $ 733.9 | $ 732.4 | $ 733.9
Other comprehensive income, net of tax | 10.8 | 15.9 | 9.1 | 8.2 | 11.9 | (15.5) | 35.8 | 4.6
Ending balance | 721.0 | 720.7 | 735.0 | 719.3 | 718.8 | 721.1 | 721.0 | 719.3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (18.4) |  | (19.8) | (31.2) |  | (33.2) | (19.8) | (33.2)
Less: income tax benefit (expense) | (0.2) |  |  | (0.3) |  |  | (0.7) | (0.9)
Net loss (gain) reclassified from AOCI to Net (loss) income | 0.8 |  |  | 0.9 |  |  | 2.2 | 2.8
Translation impact on Canadian pension plan AOCI balance |  |  |  | (0.1) |  |  |  |
Other comprehensive income, net of tax | 0.8 |  |  | 0.8 |  |  | 2.2 | 2.8
Ending balance | (17.6) | (18.4) |  | (30.4) | (31.2) |  | (17.6) | (30.4)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Reclassification from AOCI | 0.1 |  |  |  |  |  | 0.3 | 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 | 0.9 |  |  | 1.2 |  |  | 2.6 | 3.5
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  |  | (0.2) |  | 0.3 |  | 0.3
Unrealized gain (loss) on securities |  |  |  |  |  |  |  | 1.4
Less: income tax benefit (expense) |  |  |  |  |  |  |  | (0.3)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  |  |  |  |  |  |  | 1.1
Reclassification from AOCI |  |  |  |  |  |  |  | (2.1)
Less: income tax benefit (expense) |  |  |  |  |  |  |  | 0.5
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  |  |  |  |  |  | (1.6)
Other comprehensive income, net of tax |  |  |  |  |  |  |  | (0.5)
Ending balance |  |  |  | (0.2) | (0.2) |  |  | (0.2)
AOCI, Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 24.8 |  | 1.1 | (10.7) |  | (5.6) | 1.1 | (5.6)
Unrealized gain (loss) on securities | 29.8 |  |  | 7.8 |  |  | 72.1 | (16.0)
Less: income tax benefit (expense) | (7.0) |  |  | (1.9) |  |  | (17.0) | 4.0
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | 22.8 |  |  | 5.9 |  |  | 55.1 | (12.0)
Reclassification from AOCI | (16.7) |  |  | 1.8 |  |  | (28.1) | 18.1
Reclassification due to forecasted transactions no longer probable of occurring |  |  |  | 0.1 |  |  |  | 0.8
Less: income tax benefit (expense) | 3.9 |  |  | (0.5) |  |  | 6.7 | (4.7)
Net loss (gain) reclassified from AOCI to Net (loss) income | (12.8) |  |  | 1.4 |  |  | (21.4) | 14.2
Other comprehensive income, net of tax | 10.0 |  |  | 7.3 |  |  | 33.7 | 2.2
Ending balance | 34.8 | 24.8 |  | (3.4) | (10.7) |  | 34.8 | (3.4)
AOCI, Excluded Component of Derivative Qualifying as Fair Value Hedge Attributable to Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 0.0 |  | 0.0
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 benefit (expense) |  |  |  |  |  |  |  | (0.2)
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  |  |  |  |  |  | 0.8
Ending balance |  |  |  | 0.0 |  |  |  | 0.0
AOCI, Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (0.1) |  |  | (0.1) |  | (0.1) |  | (0.1)
Other comprehensive income, net of tax |  |  |  | 0.1 |  |  | (0.1) | 0.1
Ending balance | (0.1) | (0.1) |  |  | (0.1) |  | (0.1) |
AOCI Attributable to Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 6.3 | (9.6) | (18.7) | (42.2) | (54.1) | (38.6) | (18.7) | (38.6)
Other comprehensive income, net of tax | 10.8 | 15.9 | 9.1 | 8.2 | 11.9 | (15.5) |  |
Ending balance | $ 17.1 | $ 6.3 | $ (9.6) | $ (34.0) | $ (42.2) | $ (54.1) | $ 17.1 | $ (34.0)

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