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Business Segments - Amortization of Deferred Policy Acquisition Costs By Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs | $ 408.3 | $ 377.1 | $ 318.3
Specialty Property & Casualty Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs | 224.9 | 202.0 | 150.2
Preferred Property & Casualty Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs | 120.1 | 117.2 | 114.6
Life & Health Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs | $ 63.3 | $ 57.9 | $ 53.5

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