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Investments (Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost $ 8,888.9 $ 8,870.8
Fixed maturity securities, fair value 9,732.4 9,572.1
Equity securities, cost or amortized cost 348.7 381.8
Equity securities, fair value 403.3 421.4
Fixed maturity securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 8,888.9 8,870.8
Fixed maturity securities, gross unrealized gains 865.4 734.2
Fixed maturity securities, gross unrealized losses (21.9) (32.9)
Fixed maturity securities, fair value 9,732.4 9,572.1
OTTI in AOCI [1] 27.4 31.7
Fixed maturity securities | U.S. government and government agencies and authorities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 176.1 172.8
Fixed maturity securities, gross unrealized gains 3.5 3.4
Fixed maturity securities, gross unrealized losses (0.6) (1.3)
Fixed maturity securities, fair value 179.0 174.9
OTTI in AOCI [1] 0.0 0.0
Fixed maturity securities | States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 357.2 446.9
Fixed maturity securities, gross unrealized gains 27.6 29.6
Fixed maturity securities, gross unrealized losses (0.1) (0.4)
Fixed maturity securities, fair value 384.7 476.1
OTTI in AOCI [1] 0.0 0.0
Fixed maturity securities | Foreign governments    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 525.8 508.9
Fixed maturity securities, gross unrealized gains 58.4 60.5
Fixed maturity securities, gross unrealized losses (0.8) (0.9)
Fixed maturity securities, fair value 583.4 568.5
OTTI in AOCI [1] 0.0 0.0
Fixed maturity securities | Asset-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 136.3 2.6
Fixed maturity securities, gross unrealized gains 1.3 1.2
Fixed maturity securities, gross unrealized losses (0.2) (0.1)
Fixed maturity securities, fair value 137.4 3.7
OTTI in AOCI [1] 1.0 1.1
Fixed maturity securities | Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 40.1 39.3
Fixed maturity securities, gross unrealized gains 0.2 0.1
Fixed maturity securities, gross unrealized losses (0.8) (1.0)
Fixed maturity securities, fair value 39.5 38.4
OTTI in AOCI [1] 0.0 0.0
Fixed maturity securities | Residential mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 1,114.4 1,071.2
Fixed maturity securities, gross unrealized gains 38.9 38.1
Fixed maturity securities, gross unrealized losses (6.0) (8.0)
Fixed maturity securities, fair value 1,147.3 1,101.3
OTTI in AOCI [1] 11.1 12.8
Fixed maturity securities | U.S. corporate    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 4,856.1 5,022.7
Fixed maturity securities, gross unrealized gains 569.6 454.1
Fixed maturity securities, gross unrealized losses (5.3) (15.6)
Fixed maturity securities, fair value 5,420.4 5,461.2
OTTI in AOCI [1] 15.3 15.6
Fixed maturity securities | Foreign corporate    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 1,682.9 1,606.4
Fixed maturity securities, gross unrealized gains 165.9 147.2
Fixed maturity securities, gross unrealized losses (8.1) (5.6)
Fixed maturity securities, fair value 1,840.7 1,748.0
OTTI in AOCI [1] 0.0 2.2
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, cost or amortized cost 348.7 381.8
Equity securities, gross unrealized gains 54.9 40.7
Equity securities, gross unrealized losses (0.3) (1.1)
Equity securities, fair value 403.3 421.4
OTTI in AOCI [1] 0.0 0.0
Equity securities | Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, cost or amortized cost 7.0 11.9
Equity securities, gross unrealized gains 7.7 8.9
Equity securities, gross unrealized losses 0.0 0.0
Equity securities, fair value 14.7 20.8
OTTI in AOCI [1] 0.0 0.0
Equity securities | Non-redeemable preferred stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, cost or amortized cost 341.7 369.9
Equity securities, gross unrealized gains 47.2 31.8
Equity securities, gross unrealized losses (0.3) (1.1)
Equity securities, fair value 388.6 400.6
OTTI in AOCI [1] $ 0.0 $ 0.0
[1] Represents the amount of OTTI recognized in accumulated other comprehensive income (“AOCI”). Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.