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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 732.4 | $ 733.9
Other comprehensive income (loss), net of tax | 9.1 | (15.5)
Ending balance | 735.0 | 721.1
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (19.8) | (33.2)
Less: income tax (expense) benefit | (0.3) | (0.3)
Net loss (gain) reclassified from AOCI to Net income | 0.7 | 1.0
Translation impact on Canadian pension plan AOCI balance |  | 0.1
Other comprehensive income (loss), net of tax | 0.7 | 1.1
Ending balance | (19.1) | (32.1)
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 | 0.1
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
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) |  | (0.3)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | 1.0
Reclassification from AOCI |  | (1.5)
Less: income tax (expense) benefit |  | 0.3
Net loss (gain) reclassified from AOCI to Net income |  | (1.2)
Other comprehensive income (loss), net of tax |  | (0.2)
Ending balance |  | 0.1
AOCI, Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 1.1 | (5.6)
Unrealized gain (loss) on securities | 13.9 | (27.9)
Less: income tax benefit (expense) | (3.3) | 6.8
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | 10.6 | (21.1)
Reclassification from AOCI | (2.7) | 7.0
Less: income tax (expense) benefit | 0.6 | (1.8)
Net loss (gain) reclassified from AOCI to Net income | (2.1) | 5.2
Other comprehensive income (loss), net of tax | 8.5 | (15.9)
Ending balance | 9.6 | (21.5)
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 |  | (0.8)
Less: income tax benefit (expense) |  | 0.2
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | (0.6)
Reclassification from AOCI |  | 0.2
Less: income tax (expense) benefit |  | (0.1)
Net loss (gain) reclassified from AOCI to Net income |  | 0.1
Other comprehensive income (loss), net of tax |  | (0.5)
Ending balance |  | (0.5)
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) |
Ending balance | (0.1) | (0.1)
AOCI Attributable to Parent |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (18.7) | (38.6)
Other comprehensive income (loss), net of tax | 9.1 | (15.5)
Ending balance | $ (9.6) | $ (54.1)

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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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