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Investments (Continuous unrealized loss) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
U.S. Government and Government Agencies and Authorities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 461.9 140.0
12 Months or Longer $ 39.7 $ 103.4
Total 501.6 243.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 18.8 1.1
12 Months or Longer 1.1 5.1
Total $ 19.9 $ 6.2
States and Political Subdivisions    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 293.4 57.0
12 Months or Longer $ 57.1 $ 124.2
Total 350.5 181.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 8.4 0.3
12 Months or Longer 1.7 2.0
Total $ 10.1 $ 2.3
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 3.6  
12 Months or Longer $ 0.7  
Total 4.3  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 0.4  
12 Months or Longer 0.0  
Total $ 0.4  
Bonds and Notes    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 965.5 283.1
12 Months or Longer $ 161.2 $ 208.9
Total 1,126.7 492.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 30.6 4.2
12 Months or Longer 4.8 6.8
Total $ 35.4 $ 11.0
Collateralized Loan Obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 77.8 2.8
12 Months or Longer $ 22.1 $ 2.4
Total 99.9 5.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 0.7 0.0
12 Months or Longer 0.1 0.0
Total $ 0.8 $ 0.0
Other Mortgage- and Asset-backed    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 4.5  
12 Months or Longer $ 0.0  
Total 4.5  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 0.1  
12 Months or Longer 0.0  
Total $ 0.1  
Investments in Fixed Maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 1,806.7 482.9
12 Months or Longer $ 280.8 $ 438.9
Total 2,087.5 921.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 59.0 5.6
12 Months or Longer 7.7 13.9
Total $ 66.7 $ 19.5