XML 55 R44.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 5,781.3 | $ 5,765.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 82.3 | 85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (35.7) | (40.8)
Available-for-sale Securities | 5,827.9 | 5,809.9
U.S. government |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,267.1 | 1,207.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 9.3 | 9.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (9.3) | (11.2)
Available-for-sale Securities | 1,267.1 | 1,206.1
U.S. agency |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 106.1 | 117.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.3 | 1.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 107.4 | 119.6
Municipal |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 22.9 | 23.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.7 | 1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (0.2) | (0.4)
Available-for-sale Securities | 24.4 | 24.4
Corporate |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,564.5 | 2,566.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 40.0 | 39.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (16.8) | (20.0)
Available-for-sale Securities | 2,587.7 | 2,586.5
Non-U.S. government-backed corporate |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 84.0 | 89.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.6 | 0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (0.1) | (0.1)
Available-for-sale Securities | 84.5 | 89.8
Non-U.S. government |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 483.2 | 477.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 11.4 | 11.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (0.4) | (0.8)
Available-for-sale Securities | 494.2 | 488.7
Asset-backed |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 54.5 | 62.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.3 | 0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 54.8 | 63.0
Non-agency commercial mortgage-backed |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 11.3 | 12.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.2 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 11.5 | 12.6
Agency mortgage-backed |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,024.2 | 1,062.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 17.5 | 19.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (8.9) | (8.3)
Available-for-sale Securities | 1,032.8 | 1,073.9
Total fixed income securities — Available for sale |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 5,617.8 | 5,620.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 82.3 | 85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (35.7) | (40.8)
Available-for-sale Securities | 5,664.4 | 5,664.6
Total short-term investments — Available for sale |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 163.5 | 145.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | $ 163.5 | $ 145.3

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |