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Investments - Schedule of Contractual Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Due in One Year or Less, Amortized Cost | $ 101.6 |
Due in One Year or Less, Fair Value | 102.8 |
Due after One Year to Five Years, Amortized Cost | 836.7 |
Due after One Year to Five Years, Fair Value | 867.0 |
Due after Five Years to Ten Years, Amortized Cost | 1,608.6 |
Due after Five Years to Ten Years, Fair Value | 1,652.4 |
Due after Ten Years, Amortized Cost | 2,038.2 |
Due after Ten Years, Fair Value | 2,233.0 |
Asset-backed Securities Not Due at a Single Maturity Date, Amortized Cost | 261.7 |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 269.7 |
Amortized Cost | 4,846.8 | $ 4,560.7
Investments in Fixed Maturities, Fair Value | 5,124.9 | $ 4,852.3
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 126.2 |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 13.9 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 4.8 |
Other Non-Governmental Issuers [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | $ 124.8 |

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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: 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
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth through tenth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second through fifth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 2: 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
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