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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | $ 3,972.3 |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 4,563.4 | $ 3,972.3 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | (16.8) | (28.1) | $ 21.9
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 3.6 | 5.8 | 4.6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (13.2) | (22.3) | (17.3)
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs | 70.2 | (7.8) | (6.9)
Tax Effects from Postretirement Benefit Plans | (15.3) | 1.7 | 1.5
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax | 54.9 | (6.1) | (5.4)
Gain (Loss) on Cash Flow Hedges | 0.4 | 0.4 | 1.2
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | 0.0 | (0.1) | (0.3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 0.4 | 0.3 | 0.9
Other Comprehensive Income (Loss) Before Income Taxes | 437.9 | 397.9 | (241.5)
Other Comprehensive Income Tax Benefit (Expense) | (93.5) | (83.6) | 50.7
Other Comprehensive Income (Loss) | 344.4 | 314.3 | (190.8)
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax | 0.0 | 0.0 | (0.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 0.0 | 0.0 | 0.2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax | 0.0 | 0.0 | 0.3
No Credit Losses Recognized in Consolidated Statements of Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | 386.7 | 433.4 | (214.2)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | (82.3) | (91.0) | 45.0
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | 304.4 | 342.4 | (169.2)
Credit Losses Recognized in Consolidated Statements of Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | (2.6) | 0.0 | 0.0
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | 0.5 | 0.0 | 0.0
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (2.1) | 0.0 | 0.0
Having No Credit Losses Recognized in Consolidated Statements of Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | 439.4 | 119.3 | 306.0
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 304.4 | 342.4 | (169.2)
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | (13.2) | (22.3) | (17.3)
Other Comprehensive Income (Loss), Net of Tax | 291.2 | 320.1 | (186.5)
Stockholders' Equity Attributable to Parent, Ending Balance | 730.6 | 439.4 | 119.3
Having Credit Losses Recognized in Consolidated Statements of Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | (2.1) | 0.0 | 0.0
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Net of Tax | (2.1) | 0.0 | 0.0
Stockholders' Equity Attributable to Parent, Ending Balance | (2.1) | 0.0 | 0.0
Foreign Currency Translation Adjustments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | 0.0 | 0.0 | (0.2)
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 0.0 | 0.0 | (0.1)
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 0.0 | 0.0 | 0.3
Other Comprehensive Income (Loss), Net of Tax | 0.0 | 0.0 | 0.2
Stockholders' Equity Attributable to Parent, Ending Balance | 0.0 | 0.0 | 0.0
Net Unrecognized Postretirement Benefit Costs |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | (100.6) | (94.5) | (89.2)
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 4.3 | (6.1) | (5.4)
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 50.6 | 0.0 | 0.0
Other Comprehensive Income (Loss), Net of Tax | 54.9 | (6.1) | (5.4)
Stockholders' Equity Attributable to Parent, Ending Balance | (45.7) | (100.6) | (94.5)
Gain (Loss) on Cash Flow Hedges |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | (2.7) | (3.0) | (4.0)
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 0.4 | 0.3 | 0.9
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Net of Tax | 0.4 | 0.3 | 0.9
Stockholders' Equity Attributable to Parent, Ending Balance | (2.3) | (2.7) | (3.0)
Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | 336.1 | 21.8 | 212.6
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 307.0 | 336.6 | (173.8)
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 37.4 | (22.3) | (17.0)
Other Comprehensive Income (Loss), Net of Tax | 344.4 | 314.3 | (190.8)
Stockholders' Equity Attributable to Parent, Ending Balance | 680.5 | 336.1 | 21.8
Other Comprehensive Income (Loss) | $ 344.4 | $ 314.3 | (190.8)
Previously Reported | Having No Credit Losses Recognized in Consolidated Statements of Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | 269.7
Previously Reported | Having Credit Losses Recognized in Consolidated Statements of Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | 0.0
Previously Reported | Foreign Currency Translation Adjustments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | 0.2
Previously Reported | Net Unrecognized Postretirement Benefit Costs |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | (72.2)
Previously Reported | Gain (Loss) on Cash Flow Hedges |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | (3.3)
Previously Reported | Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | 194.4
Cumulative Effect of Adoption of New Accounting Standard | Having No Credit Losses Recognized in Consolidated Statements of Income | Cumulative Effect of Adoption of New Accounting Standards |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | 36.3
Cumulative Effect of Adoption of New Accounting Standard | Having Credit Losses Recognized in Consolidated Statements of Income | Cumulative Effect of Adoption of New Accounting Standards |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | 0.0
Cumulative Effect of Adoption of New Accounting Standard | Foreign Currency Translation Adjustments | Cumulative Effect of Adoption of New Accounting Standards |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | (0.4)
Cumulative Effect of Adoption of New Accounting Standard | Net Unrecognized Postretirement Benefit Costs | Cumulative Effect of Adoption of New Accounting Standards |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | (17.0)
Cumulative Effect of Adoption of New Accounting Standard | Gain (Loss) on Cash Flow Hedges | Cumulative Effect of Adoption of New Accounting Standards |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | (0.7)
Cumulative Effect of Adoption of New Accounting Standard | Accumulated Other Comprehensive Income (Loss) | Cumulative Effect of Adoption of New Accounting Standards |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance |  |  | $ 18.2

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