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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 735.0 | $ 732.4 | $ 721.1 | $ 733.9 | $ 732.4 | $ 733.9
Other comprehensive income (loss), net of tax | 15.9 | 9.1 | 11.9 | (15.5) | 25.0 | (3.6)
Ending balance | 720.7 | 735.0 | 718.8 | 721.1 | 720.7 | 718.8
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (19.1) | (19.8) | (32.1) | (33.2) | (19.8) | (33.2)
Less: income tax benefit (expense) | (0.2) |  | (0.3) |  | (0.5) | (0.6)
Net loss (gain) reclassified from AOCI to Net (loss) income | 0.7 |  | 0.9 |  | 1.4 | 1.9
Translation impact on Canadian pension plan AOCI balance |  |  |  |  |  | 0.1
Other comprehensive income (loss), net of tax | 0.7 |  | 0.9 |  | 1.4 | 2.0
Ending balance | (18.4) | (19.1) | (31.2) | (32.1) | (18.4) | (31.2)
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 |  | 0.2 | 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 | 0.8 |  | 1.1 |  | 1.7 | 2.3
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 0.1 | 0.3 |  | 0.3
Unrealized gain (loss) on securities |  |  | 0.1 |  |  | 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 |  |  | 0.1 |  |  | 1.1
Reclassification from AOCI |  |  | (0.6) |  |  | (2.1)
Less: income tax benefit (expense) |  |  | 0.2 |  |  | 0.5
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  | (0.4) |  |  | (1.6)
Other comprehensive income (loss), net of tax |  |  | (0.3) |  |  | (0.5)
Ending balance |  |  | (0.2) | 0.1 |  | (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 | 9.6 | 1.1 | (21.5) | (5.6) | 1.1 | (5.6)
Unrealized gain (loss) on securities | 28.4 |  | 4.1 |  | 42.3 | (23.8)
Less: income tax benefit (expense) | (6.7) |  | (0.9) |  | (10.0) | 5.9
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges | 21.7 |  | 3.2 |  | 32.3 | (17.9)
Reclassification from AOCI | (8.7) |  | 9.3 |  | (11.4) | 16.3
Reclassification due to forecasted transactions no longer probable of occurring |  |  | 0.7 |  |  | 0.7
Less: income tax benefit (expense) | 2.2 |  | (2.4) |  | 2.8 | (4.2)
Net loss (gain) reclassified from AOCI to Net (loss) income | (6.5) |  | 7.6 |  | (8.6) | 12.8
Other comprehensive income (loss), net of tax | 15.2 |  | 10.8 |  | 23.7 | (5.1)
Ending balance | 24.8 | 9.6 | (10.7) | (21.5) | 24.8 | (10.7)
AOCI, Excluded Component of Derivative Qualifying as Fair Value Hedge Attributable to Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | (0.5) |  |  |
Unrealized gain (loss) on securities |  |  | (0.2) |  |  | (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 |  |  | (0.2) |  |  | (0.8)
Reclassification from AOCI |  |  | 0.2 |  |  | 0.4
Reclassification due to cancellation of firm commitment |  |  | 0.6 |  |  | 0.6
Less: income tax benefit (expense) |  |  | (0.1) |  |  | (0.2)
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  | 0.7 |  |  | 0.8
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) |  | (0.1) | (0.1) |  | (0.1)
Other comprehensive income (loss), net of tax |  |  |  |  | (0.1) |
Ending balance | (0.1) | (0.1) | (0.1) | (0.1) | (0.1) | (0.1)
AOCI Attributable to Parent |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (9.6) | (18.7) | (54.1) | (38.6) | (18.7) | (38.6)
Other comprehensive income (loss), net of tax | 15.9 | 9.1 | 11.9 | (15.5) |  |
Ending balance | $ 6.3 | $ (9.6) | $ (42.2) | $ (54.1) | $ 6.3 | $ (42.2)

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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