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Accumulated Other Comprehensive (Loss) Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 733.9 | $ 740.4 | $ 746.3
Other comprehensive income (loss), net of tax | 19.9 | 10.2 | (11.7)
Ending balance | 732.4 | 733.9 | 740.4
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (33.2) | (35.6) | (38.5)
Less: income tax (expense) benefit | (1.2) | (1.4) | (1.5)
Net loss (gain) reclassified from AOCI to Net income | 3.9 | 4.7 | 4.8
Translation impact on Canadian pension plan AOCI balance | (0.1) | (0.1) |
Other comprehensive income (loss), net of tax | 13.4 | 2.4 | 2.9
Ending balance | (19.8) | (33.2) | (35.6)
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 | 0.4 | (0.4) | 4.4
Less: income tax (expense) benefit | (0.1) | 0.1 | (1.1)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | 0.3 | (0.3) | 3.3
Reclassification from AOCI | 0.4 | 0.5 | 0.9
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 | 12.3 | (2.5) | (6.9)
Less: income tax (expense) benefit | (3.0) | 0.6 | 1.7
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | 9.3 | (1.9) | (5.2)
Reclassification from AOCI | 4.7 | 5.6 | 5.4
AOCI, Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (5.6) | (13.4) | 0.5
Unrealized gain (loss) on securities | (9.4) | (9.5) | (21.2)
Less: income tax (expense) benefit | 2.3 | 2.3 | 5.3
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | (7.1) | (7.2) | (15.9)
Reclassification from AOCI | 17.4 | 19.7 | 2.7
Reclassification due to forecasted transactions no longer probable of occurring | 0.8 |  |
Less: income tax (expense) benefit | (4.4) | (4.7) | (0.7)
Net loss (gain) reclassified from AOCI to Net income | 13.8 | 15.0 | 2.0
Other comprehensive income (loss), net of tax | 6.7 | 7.8 | (13.9)
Ending balance | 1.1 | (5.6) | (13.4)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0.3 | 0.3 | 0.9
Unrealized gain (loss) on securities | 1.3 | 4.4 | 4.7
Less: income tax (expense) benefit | (0.7) | (1.1) | (1.1)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | 0.6 | 3.3 | 3.6
Reclassification from AOCI | (2.0) | (4.4) | (5.4)
Less: income tax (expense) benefit | 1.1 | 1.1 | 1.2
Net loss (gain) reclassified from AOCI to Net income | (0.9) | (3.3) | (4.2)
Other comprehensive income (loss), net of tax | (0.3) |  | (0.6)
Ending balance |  | 0.3 | 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 (expense) benefit | 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 | (0.2) |  |
Net loss (gain) reclassified from AOCI to Net income | 0.8 |  |
AOCI, Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (0.1) | (0.1) |
Other comprehensive income (loss), net of tax | 0.1 |  | (0.1)
Ending balance |  | (0.1) | (0.1)
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (38.6) | (48.8) | (36.7)
Other comprehensive income (loss), net of tax | 19.9 | 10.2 | (11.7)
Ending balance | $ (18.7) | $ (38.6) | $ (48.8)

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