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Investments (Continuous unrealized loss) (Details) - USD ($)
$ in Millions
Sep. 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 594.0 140.0
12 Months or Longer $ 56.5 $ 103.4
Total 650.5 243.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 20.0 1.1
12 Months or Longer 8.4 5.1
Total $ 28.4 $ 6.2
States and Political Subdivisions    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 486.4 57.0
12 Months or Longer $ 0.0 $ 124.2
Total 486.4 181.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 14.6 0.3
12 Months or Longer 0.0 2.0
Total $ 14.6 $ 2.3
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 4.8  
12 Months or Longer $ 0.0  
Total 4.8  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 0.5  
12 Months or Longer 0.0  
Total $ 0.5  
Bonds and Notes    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 1,237.5 283.1
12 Months or Longer $ 302.3 $ 208.9
Total 1,539.8 492.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 32.2 4.2
12 Months or Longer 9.7 6.8
Total $ 41.9 $ 11.0
Collateralized Loan Obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 204.6 2.8
12 Months or Longer $ 0.0 $ 2.4
Total 204.6 5.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 1.0 0.0
12 Months or Longer 0.0 0.0
Total $ 1.0 $ 0.0
Other Mortgage- and Asset-backed    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less Than 12 Months 7.5  
12 Months or Longer $ 0.0  
Total 7.5  
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 2,534.8 482.9
12 Months or Longer $ 358.8 $ 438.9
Total 2,893.6 921.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less Than 12 Months 68.4 5.6
12 Months or Longer 18.1 13.9
Total $ 86.5 $ 19.5