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Acquisition of Business (Purchase Price Allocations) (Details) $ in Millions | Jul. 02, 2018 USD ($)
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Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 1,548.7
Investments [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 1,569.3
Short-term Investments [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets | 98.8
Cash [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 4.0
Premiums Receivable [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 583.4
Receivables Other Than Premium Receivables [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 31.7
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 262.7
Goodwill [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 789.4
Current Income Tax Asset [Member] |
Business Acquisition [Line Items] |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 0.8
Other Assets Acquired [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 102.1
Property and Casualty Insurance Reserves [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (713.6)
Unearned Premiums [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (715.6)
Debt [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | (282.1)
Deferred Income Tax Liabilities [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (11.3)
Other Liabilities [Member] |
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ (170.9)

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