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Acquisition of Business - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 23, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) agent | Dec. 31, 2019 USD ($) | Apr. 01, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Repayments of secured debt |  | $ 394,000,000.0 | $ 304,800,000 | $ 383,600,000 |
Goodwill |  | 1,312,000,000 | 1,114,000,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  | $ 370,900,000
Business Acquisition, Pro Forma Revenue |  | 5,884,200,000 | 5,585,700,000 |  |
Business Acquisition, Pro Forma Total Expenses |  | 6,109,500,000 | 5,040,100,000 |  |
Business Acquisition, Pro Forma Net Income (Loss) |  | (225,300,000) | 545,600,000 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  | $ (105,100,000) | 443,000,000.0 |  |
License |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  |  | 2,500,000
Customer Relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  | 4,800,000
Agent Relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  | 7,200,000
Software Development |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  | 6,500,000
Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  | 1,800,000
Property and Casualty Insurance Reserves |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | (211,100,000)
Unearned Premium |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | (177,800,000)
Deferred Income Tax Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | (7,800,000)
Other Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | (51,000,000.0)
Interest on Fixed Income Securities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  |  |  | 151,200,000
Dividends on Equity Securities Excluding Alternative Investments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  |  |  | 82,400,000
Short-term Investments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  |  |  | 100,100,000
Cash |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 54,300,000
Premiums Receivable |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 148,900,000
Receivables Other than Premium Receivable |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 2,000,000.0
Goodwill |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 198,000,000.0
Current Income Tax Asset |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 300,000
Other Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 81,400,000
American Access Casualty Company |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total consideration transferred | $ 370,900,000 |  |  |  |
Direct Premiums Written |  |  | $ 350,000,000 |  |
Present Value of Future Insurance Profits, Net |  |  |  |  | $ 42,900,000
Number Of Independent Agents | agent |  |  | 600 |  |

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