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Schedule 2 - Parent Company Financial Statements - Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ (120.5)	$ 409.9	$ 531.1
Reclassification Adjustments for Amounts Included in Net Income (Loss):
Net Unrecognized Postretirement Benefit Costs	(8.8)	70.2	(7.8)
Gains (Losses) on Cash Flow Hedge	0.5	0.4	0.4
Other Comprehensive Income (Loss) Before Income Taxes	(294.8)	437.9	397.9
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Unrealized Holding Gains and Losses	(60.1)	(78.3)	(85.2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment		(13.5)
Reclassification Adjustments for Amounts Included in Net Income (Loss):
Changes in Gain (Loss) on Cash Flow Hedges	(0.5)	(0.4)	(0.4)
Other Comprehensive Income Tax Benefit (Expense)	62.4	(93.5)	(83.6)
Other Comprehensive Income (Loss), Net of Taxes	(232.4)	344.4	314.3
Total Comprehensive Income (Loss)	(352.9)	754.3	845.4
Pension Obligation Settlement Costs		64.1
Credit Losses
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities	(2.0)	(2.6)
No Credit Losses
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities	(284.5)	369.9	405.3
Subsidiaries
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Reclassification Adjustment for Amounts Included in Net Income	(43.5)	(16.6)	(27.9)
Unrecognized Postretirement Benefit Costs Arising During the Year	0.6	0.0	(0.6)
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Reclassification Adjustment for Amounts Included in Net Income	9.1	3.5	5.8
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	(0.1)
Subsidiaries | Credit Losses
Changes in Net Unrealized Gains (Losses) on Investment Securities:
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment	(2.0)	(2.6)
Changes in Net Unrealized Gains (Losses) on Investment Securities:
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	0.4	0.5
Subsidiaries | No Credit Losses
Changes in Net Unrealized Gains (Losses) on Investment Securities:
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment	(230.4)	378.7	433.2
Changes in Net Unrealized Gains (Losses) on Investment Securities:
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	48.4	(80.6)	(91.0)
Parent Company
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(120.5)	409.9	531.1
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Reclassification Adjustment for Amounts Included in Net Income	(10.6)	(0.1)	(0.2)
Unrecognized Postretirement Benefit Costs Arising During the Year	(9.5)	3.6	(4.2)
Reclassification Adjustments for Amounts Included in Net Income (Loss):
Amortization of Unrecognized Postretirement Benefits (Costs)	0.1	2.5	(3.0)
Gains (Losses) on Cash Flow Hedge	0.5	0.4	0.4
Other Comprehensive Income (Loss) Before Income Taxes	(294.8)	438.0	397.9
Reclassification Adjustment for Amounts Included in Net Income (Loss):
Reclassification Adjustment for Amounts Included in Net Income	2.2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	2.5	(1.3)	1.0
Reclassification Adjustments for Amounts Included in Net Income (Loss):
Amortization of Unrecognized Postretirement Benefit Costs	0.0	(0.5)	0.7
Changes in Gain (Loss) on Cash Flow Hedges	(0.1)	0.0	(0.1)
Changes in Gain (Loss) on Cash Flow Hedges	(0.5)	(0.4)	(0.4)
Other Comprehensive Income Tax Benefit (Expense)	62.4	(93.6)	(83.6)
Other Comprehensive Income (Loss), Net of Taxes	(232.4)	344.4	314.3
Total Comprehensive Income (Loss)	(352.9)	754.3	845.4
Pension Obligation Settlement Costs		64.1
Parent Company | No Credit Losses
Changes in Net Unrealized Gains (Losses) on Investment Securities:
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment	0.0	8.0	0.2
Changes in Net Unrealized Gains (Losses) on Investment Securities:
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	$ 0.0	$ (1.7)	$ 0.0

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-Name Accounting Standards Codification
-Topic 220
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