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Business Segments - Amortization of Deferred Policy Acquisitions Costs By Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | $ 377.1 | $ 318.3 | $ 299.3
Preferred Property & Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | 117.2 | 114.6 | 115.3
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | 377.1 | 318.3 | 299.3
Specialty Property & Casualty Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | 202.0 | 150.2 | 136.8
Life and Health Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of Deferred Policy Acquisition Costs | $ 57.9 | $ 53.5 | $ 47.2

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- Definition Amount of amortization expense (reversal of expense) for deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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