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Fair Value of Financial Instruments - Quantitative Estimates for Level 3 Assets (Details) - Level 3 - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets $ 2,175.1 $ 2,146.8
U.S. government and agency    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets 86.1 80.2
State and political subdivision    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets 203.6 193.3
Corporate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets 1,463.3 1,417.2
Other asset-backed (“ABS”)    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets 70.7 77.9
Fair value investments    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets 29.4 33.7
Discounted cash flow | U.S. government and agency    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets $ 86.1 $ 80.2
Discounted cash flow | U.S. government and agency | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 0.92% 1.02%
Discounted cash flow | U.S. government and agency | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 3.89% 3.64%
Discounted cash flow | U.S. government and agency | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 2.86% 2.75%
Discounted cash flow | State and political subdivision    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets $ 94.6 $ 65.9
Discounted cash flow | State and political subdivision | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 2.25% 2.34%
Discounted cash flow | State and political subdivision | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 4.75% 4.50%
Discounted cash flow | State and political subdivision | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 3.56% 3.33%
Discounted cash flow | Corporate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets $ 1,160.9 $ 1,053.3
Discounted cash flow | Corporate | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 0.92% 0.93%
Discounted cash flow | Corporate | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 7.31% 6.88%
Discounted cash flow | Corporate | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 3.51% 3.35%
Discounted cash flow | Other asset-backed (“ABS”)    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets $ 9.3 $ 9.8
Discounted cash flow | Other asset-backed (“ABS”) | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 1.64% 1.83%
Discounted cash flow | Other asset-backed (“ABS”) | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 3.05% 3.01%
Discounted cash flow | Other asset-backed (“ABS”) | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Yield 1.86% 2.01%
Discounted cash flow | Fair value investments    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value, assets $ 1.0 $ 1.0
Default rate 0.16% 0.17%
Recovery rate 44.00% 44.00%