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Catastrophe Reinsurance - Catastrophe Losses and LAE (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 1,337.9 | $ 1,103.2 | $ 908.3
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | (20.7) | (20.1) | (57.1)
Catastrophe [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 95.8 | 60.5 | 83.8
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | (19.3) | (7.8) | (14.7)
Catastrophe [Member] | Property and Casualty Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 90.4 | 56.6 | 80.7
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | (19.2) | (7.9) | (15.8)
Catastrophe [Member] | Life and Health Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 5.4 | 3.9 | 3.1
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | $ (0.1) | $ 0.1 | $ 1.1

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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