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Goodwill and Intangible Assets - Finite-lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ 175.7 | $ 109.5
Policies in force |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 256.2 | 256.2
Accumulated Amortization | 100.7 | 64.1
Net Carrying Amount | 155.5 | 192.1
Agency relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 159.2 | 159.2
Accumulated Amortization | 31.3 | 19.9
Net Carrying Amount | 127.9 | 139.3
Software rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 79.1 | 79.1
Accumulated Amortization | 29.4 | 18.8
Net Carrying Amount | 49.7 | 60.3
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 34.8 | 34.8
Accumulated Amortization | 13.7 | 6.1
Net Carrying Amount | 21.1 | 28.7
Finite-Lived Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 529.3 | 529.3
Accumulated Amortization | 175.1 | 108.9
Net Carrying Amount | $ 354.2 | $ 420.4

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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