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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	$ 449.2	$ 1,044.2
Total Gains (Losses):
Included in Consolidated Statement of Income	2.8	(9.3)
Included in Other Comprehensive Income (Loss)	1.4	(5.1)
Purchases	140.2	240.2
Settlements	(0.1)	(0.1)
Sales	(138.3)	(192.1)
Transfers into Level 3	19.8	9.0
Transfers out of Level 3	(223.6)	(637.6)
Balance at End of Year	251.4	449.2
Fair Value	7,986.9	7,605.9
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	830.6	858.5
Other Short-term Investments, Fair Value Disclosure	284.1	875.4
Redeemable Preferred Stocks
Total Gains (Losses):
Fair Value	7.4	7.5
United States Government and Government Agencies and Authorities
Total Gains (Losses):
Fair Value	637.4	585.3
States and Political Subdivisions
Total Gains (Losses):
Fair Value	1,890.1	1,589.5
Foreign Governments
Total Gains (Losses):
Fair Value	5.5	5.2
Corporate Bonds and Notes
Total Gains (Losses):
Fair Value	4,386.9	4,425.4
Collateralized Loan Obligations
Total Gains (Losses):
Fair Value	752.1	767.7
Other Mortgage- and Asset-backed
Total Gains (Losses):
Fair Value	307.5	225.3
Fair Value, Recurring
Total Gains (Losses):
Convertible securities at fair value	46.4	39.9
Investments, Fair Value Disclosure	8,863.9	8,504.3
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Investments, Fair Value Disclosure	586.6	639.5
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Convertible securities at fair value	46.4	39.9
Investments, Fair Value Disclosure	7,700.9	7,123.4
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Investments, Fair Value Disclosure	251.4	449.2
Fair Value, Recurring | Measured at Net Asset Value
Total Gains (Losses):
Investments, Fair Value Disclosure	325.0	292.2
Fair Value, Recurring | Redeemable Preferred Stocks
Total Gains (Losses):
Fair Value	7.4
Fair Value, Recurring | Redeemable Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value		0.0
Fair Value, Recurring | Redeemable Preferred Stocks | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value		1.3
Fair Value, Recurring | Redeemable Preferred Stocks | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value		6.2
Fair Value, Recurring | Redeemable Preferred Stocks | Measured at Net Asset Value
Total Gains (Losses):
Fair Value		0.0
Fair Value, Recurring | United States Government and Government Agencies and Authorities
Total Gains (Losses):
Fair Value	637.4	585.3
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	132.8	134.0
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	504.6	451.3
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | States and Political Subdivisions
Total Gains (Losses):
Fair Value	1,890.1	1,589.5
Fair Value, Recurring | States and Political Subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | States and Political Subdivisions | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	1,890.1	1,589.5
Fair Value, Recurring | States and Political Subdivisions | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | States and Political Subdivisions | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Foreign Governments
Total Gains (Losses):
Fair Value	5.5	5.2
Fair Value, Recurring | Foreign Governments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Foreign Governments | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	5.5	5.2
Fair Value, Recurring | Foreign Governments | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Foreign Governments | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Corporate Bonds and Notes
Total Gains (Losses):
Fair Value	4,386.9	4,425.4
Fair Value, Recurring | Corporate Bonds and Notes | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Corporate Bonds and Notes | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	4,150.1	3,992.4
Fair Value, Recurring | Corporate Bonds and Notes | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	236.8	433.0
Fair Value, Recurring | Corporate Bonds and Notes | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Redeemable Preferred Stock
Total Gains (Losses):
Fair Value		7.5
Fair Value, Recurring | Redeemable Preferred Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	0.0
Fair Value, Recurring | Redeemable Preferred Stock | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	1.3
Fair Value, Recurring | Redeemable Preferred Stock | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	6.1
Fair Value, Recurring | Redeemable Preferred Stock | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0
Fair Value, Recurring | Collateralized Loan Obligations
Total Gains (Losses):
Fair Value	752.1	767.7
Fair Value, Recurring | Collateralized Loan Obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Collateralized Loan Obligations | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	752.1	767.7
Fair Value, Recurring | Collateralized Loan Obligations | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Collateralized Loan Obligations | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Other Mortgage- and Asset-backed
Total Gains (Losses):
Fair Value	307.5	225.3
Fair Value, Recurring | Other Mortgage- and Asset-backed | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Other Mortgage- and Asset-backed | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	300.5	215.3
Fair Value, Recurring | Other Mortgage- and Asset-backed | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	7.0	10.0
Fair Value, Recurring | Other Mortgage- and Asset-backed | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Investments in Fixed Maturities
Total Gains (Losses):
Fair Value	7,986.9	7,605.9
Fair Value, Recurring | Investments in Fixed Maturities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Fair Value	132.8	134.0
Fair Value, Recurring | Investments in Fixed Maturities | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Fair Value	7,604.2	7,022.7
Fair Value, Recurring | Investments in Fixed Maturities | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Fair Value	249.9	449.2
Fair Value, Recurring | Investments in Fixed Maturities | Measured at Net Asset Value
Total Gains (Losses):
Fair Value	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	34.2	43.7
Fair Value, Recurring | Preferred Stocks | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	17.6	15.4
Fair Value, Recurring | Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Significant Other Observable Inputs (Level 2) | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	34.2	43.7
Fair Value, Recurring | Preferred Stocks | Significant Other Observable Inputs (Level 2) | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	16.1	15.4
Fair Value, Recurring | Preferred Stocks | Significant Unobservable Inputs (Level 3) | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Significant Unobservable Inputs (Level 3) | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	1.5	0.0
Fair Value, Recurring | Preferred Stocks | Measured at Net Asset Value | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Measured at Net Asset Value | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Common Stock | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	18.9	10.4
Fair Value, Recurring | Common Stock | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	2.9	0.4
Fair Value, Recurring | Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	18.9	8.7
Fair Value, Recurring | Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	2.9	0.4
Fair Value, Recurring | Common Stock | Significant Other Observable Inputs (Level 2) | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	1.7
Fair Value, Recurring | Common Stock | Significant Other Observable Inputs (Level 2) | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)		0.0
Fair Value, Recurring | Common Stock | Significant Unobservable Inputs (Level 3) | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Common Stock | Significant Unobservable Inputs (Level 3) | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)		0.0
Fair Value, Recurring | Common Stock | Measured at Net Asset Value | Finance, Insurance and Real Estate
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Common Stock | Measured at Net Asset Value | Other Industries
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)		0.0
Fair Value, Recurring | Bond Exchange Traded Funds
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	432.0	496.4
Fair Value, Recurring | Bond Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	432.0	496.4
Fair Value, Recurring | Bond Exchange Traded Funds | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0
Fair Value, Recurring | Bond Exchange Traded Funds | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0
Fair Value, Recurring | Bond Exchange Traded Funds | Measured at Net Asset Value
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0
Fair Value, Recurring | Limited Liability Companies and Limited Partnerships
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	325.0	292.2
Fair Value, Recurring | Limited Liability Companies and Limited Partnerships | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0
Fair Value, Recurring | Limited Liability Companies and Limited Partnerships | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Limited Liability Companies and Limited Partnerships | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	0.0	0.0
Fair Value, Recurring | Limited Liability Companies and Limited Partnerships | Measured at Net Asset Value
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	325.0	292.2
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	830.6	858.5
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	453.8	505.5
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Significant Other Observable Inputs (Level 2)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	50.3	60.8
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Significant Unobservable Inputs (Level 3)
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	1.5	0.0
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Measured at Net Asset Value
Total Gains (Losses):
Equity Securities at Fair Value (Cost: 2021 - $618.7; 2020 - $684.1)	325.0	292.2
Corporate Bonds and Notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	433.0	409.1
Total Gains (Losses):
Included in Consolidated Statement of Income	2.8	(9.0)
Included in Other Comprehensive Income (Loss)	1.2	3.2
Purchases	104.6	185.9
Settlements	0.0	0.0
Sales	(128.1)	(165.2)
Transfers into Level 3	8.1	9.0
Transfers out of Level 3	(184.8)	0.0
Balance at End of Year	236.8	433.0
States and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	0.0	0.0
Total Gains (Losses):
Included in Consolidated Statement of Income		0.0
Included in Other Comprehensive Income (Loss)		0.1
Purchases		0.6
Settlements		0.0
Sales		0.0
Transfers into Level 3		0.0
Transfers out of Level 3		(0.7)
Balance at End of Year		0.0
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	6.2	6.7
Total Gains (Losses):
Included in Consolidated Statement of Income	0.0	0.0
Included in Other Comprehensive Income (Loss)	(0.1)	0.5
Purchases	0.0	0.2
Settlements	0.0	0.0
Sales	0.0	0.0
Transfers into Level 3	0.0	0.0
Transfers out of Level 3	0.0	(1.2)
Balance at End of Year	6.1	6.2
Collateralized Loan Obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	0.0	618.2
Total Gains (Losses):
Included in Consolidated Statement of Income	0.0	(0.3)
Included in Other Comprehensive Income (Loss)	0.1	(9.3)
Purchases	17.7	53.5
Settlements	0.0	0.0
Sales	(10.0)	(26.4)
Transfers into Level 3	10.0	0.0
Transfers out of Level 3	(17.8)	(635.7)
Balance at End of Year	0.0	0.0
Other Mortgage- and Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	10.0	10.2
Total Gains (Losses):
Included in Consolidated Statement of Income	0.0	0.0
Included in Other Comprehensive Income (Loss)	(0.5)	0.4
Purchases	16.2	0.0
Settlements	(0.1)	(0.1)
Sales	(0.2)	(0.5)
Transfers into Level 3	0.0	0.0
Transfers out of Level 3	(18.4)	0.0
Balance at End of Year	7.0	$ 10.0
Dividends on Equity Securities Excluding Alternative Investments
Total Gains (Losses):
Included in Other Comprehensive Income (Loss)	0.7
Purchases	1.7
Transfers into Level 3	1.7
Transfers out of Level 3	(2.6)
Balance at End of Year	$ 1.5

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Other Short-term Investments, Fair Value Disclosure

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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