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Acquisition of Business (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May. 07, 2015 | Apr. 30, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | $ 71.0 |  |  |
Insurance Expenses, Impact of Purchase Accounting Adjustments [Line Items] |  |  |  | $ (2.9) | $ (2.9)
Tax Expense, Impact of Purchase Accounting Adjustments |  |  |  | $ 1.0 | $ 1.0
Payments to Acquire Businesses, Gross |  | 71.0 |  |  |
Business Combination, Cash Held in Escrow, Indemnification Obligation |  |  | $ 17.5 |  |
Capital Contribution to Subsidiary | $ 75.0 |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | 4.5 |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  | 5.4 |  |  |
Business Combination, Indemnification Assets |  |  | 15.9 |  |
Investments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 187.0 |  |  |
Cash [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 13.4 |  |  |
Premiums Receivable [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 44.4 |  |  |
Receivables Other Than Premium Receivables [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 52.8 |  |  |
Intangible Assets Other Than Intangible Assets Arising from Insurance Contracts Acquired [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 32.6 | $ 23.6 |  |
Goodwill [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 11.2 |  |  |
Current Income Tax Asset [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 1.4 |  |  |
Other Assets Acquired [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 5.9 |  |  |
Property and Casualty Insurance Reserves [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (155.8) |  |  |
Unearned Premiums [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (85.6) |  |  |
Current and Deferred Income Taxes [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (1.5) |  |  |
Other Liabilities [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (34.8) |  |  |
General Indemnification [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Indemnification Assets, Range of Outcomes, Value, High |  | 12.5 |  |  |
Employee Related Matters [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Indemnification Assets, Range of Outcomes, Value, High |  | $ 5.0 |  |  |

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