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Schedule 1 - Investments Other Than Investments in Related Parties (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | $ 7,929.8 |  |
Amount Carried in Balance Sheet | 8,069.5 |  |
Convertible Debt, Current | 31.5 |  |
Equity Securities, FV-NI | (64.3) | $ 0.0 | $ 0.0
Fixed Maturities [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 6,284.5 |  |
Fair Value | 6,424.2 |  |
Amount Carried in Balance Sheet | 6,424.2 |  |
US Government and Government Agencies and Authorities [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 865.9 |  |
Fair Value | 865.7 |  |
Amount Carried in Balance Sheet | 865.7 |  |
States and Political Subdivisions [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 1,553.7 |  |
Fair Value | 1,619.1 |  |
Amount Carried in Balance Sheet | 1,619.1 |  |
Foreign Government Debt [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 6.5 |  |
Fair Value | 5.9 |  |
Amount Carried in Balance Sheet | 5.9 |  |
Other Corporate Bonds and Notes [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 3,307.8 |  |
Fair Value | 3,393.8 |  |
Amount Carried in Balance Sheet | 3,393.8 |  |
Collateralized Loan Obligations [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 535.7 |  |
Fair Value | 524.0 |  |
Amount Carried in Balance Sheet | 524.0 |  |
Other Mortgage and Asset-backed Securities [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 14.9 |  |
Fair Value | 15.7 |  |
Amount Carried in Balance Sheet | 15.7 |  |
Equity Securities, Investment Summary [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 684.4 |  |
Fair Value | 684.4 |  |
Amount Carried in Balance Sheet | 684.4 |  |
Preferred Stock [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 54.2 |  |
Fair Value | 54.2 |  |
Amount Carried in Balance Sheet | 54.2 |  |
Common Stock [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 10.9 |  |
Fair Value | 10.9 |  |
Amount Carried in Balance Sheet | 10.9 |  |
Other Equity Interests [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 619.3 |  |
Fair Value | 619.3 |  |
Amount Carried in Balance Sheet | 619.3 |  |
Equity Method Investments [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 187.0 |  |
Amount Carried in Balance Sheet | 187.0 |  |
Loans, Real Estate and Other Investments [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 414.8 |  |
Amount Carried in Balance Sheet | 414.8 |  |
Short-term Investments [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | 286.1 |  |
Amount Carried in Balance Sheet | $ 286.1 |  |

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- Definition The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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