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Fair Value (Details 2)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Holdings
Sep. 30, 2014
USD ($)
Holdings
Sep. 30, 2015
USD ($)
Holdings
Sep. 30, 2014
USD ($)
Holdings
Level 3        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance $ 159.0 $ 162.0 $ 194.0 $ 164.0
Included in earnings 3.0 5.0 3.0 19.0
Included in other comprehensive income (2.0) (1.0) (7.0) (2.0)
Purchases 45.0 28.0 73.0 29.0
Sales (10.0) (4.0) (34.0) (18.0)
Transfers in and (out) of Level 3 6.0 32.0 (28.0) 30.0
Ending balance 201.0 222.0 201.0 222.0
Level 3 | Net realized investment gains (losses)        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Included in earnings     (2.0) 1.0
Level 3 | Equity in earnings of limited partnerships        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Included in earnings 3.0 5.0 5.0 18.0
Indemnity        
Fair value transfers due to changes in available market observable inputs        
Transfers from level 1 to level 2 0.0 0.0 0.0 0.0
Transfers from level 2 to level 1 0.0 0.0 0.0 0.0
Transfers from level 2 to level 3 0.1 0.0 0.1 0.0
Transfers from level 3 to level 2 $ 0.0 0.0 $ 0.1 0.0
Indemnity | Fixed maturities        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 2 and Level 3 | Holdings 1   1  
No. of securities transferred between Level 3 and Level 2 | Holdings     1  
Indemnity | Level 3        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance $ 7.0 19.0 $ 8.0 20.0
Included in earnings 1.0 1.0 0.0 3.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 4.0 3.0 5.0 3.0
Sales (2.0) 0.0 (3.0) (3.0)
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 10.0 23.0 10.0 23.0
Indemnity | Level 3 | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1.0 1.0 0.0 2.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 4.0 3.0 5.0 3.0
Sales 0.0 0.0 0.0 (1.0)
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 5.0 4.0 5.0 4.0
Indemnity | Level 3 | Fixed maturities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1.0 1.0 0.0 2.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 4.0 3.0 5.0 3.0
Sales 0.0 0.0 0.0 (1.0)
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 5.0 4.0 5.0 4.0
Indemnity | Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 0.0 1.0 0.0 1.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Sales 0.0 0.0 0.0 0.0
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 0.0 1.0 0.0 1.0
Indemnity | Level 3 | Commercial mortgage-backed securities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance   0.0   0.0
Included in earnings   0.0   0.0
Included in other comprehensive income   0.0   0.0
Purchases   3.0   3.0
Sales   0.0   0.0
Transfers in and (out) of Level 3   0.0   0.0
Ending balance   3.0   3.0
Indemnity | Level 3 | Collateralized debt obligations | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1.0 0.0 0.0 1.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 4.0 0.0 5.0 0.0
Sales 0.0 0.0 0.0 (1.0)
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 5.0 0.0 5.0 0.0
Indemnity | Level 3 | Real estate | Limited partnerships        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 6.0 18.0 8.0 18.0
Included in earnings 1.0 1.0 0.0 3.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Sales (2.0) 0.0 (3.0) (2.0)
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 5.0 19.0 5.0 19.0
Exchange        
Fair value transfers due to changes in available market observable inputs        
Transfers from level 1 to level 2 0.0 0.0 0.0 14.0
Transfers from level 2 to level 1 0.0 25.0 22.0 25.0
Transfers from level 2 to level 3 6.0 43.0 8.0 43.0
Transfers from level 3 to level 2 $ 0.0 $ 11.0 $ 36.0 $ 13.0
Exchange | Fixed maturities        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 2 and Level 3 | Holdings 2 7 5 7
No. of securities transferred between Level 3 and Level 2 | Holdings   1 7 2
Exchange | Nonredeemable preferred stock        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 1 and Level 2 | Holdings       2
No. of securities transferred between Level 2 and Level 1 | Holdings   3 2 3
No. of securities transferred between Level 2 and Level 3 | Holdings 1 1 1 1
Exchange | Level 3        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance $ 152.0 $ 143.0 $ 186.0 $ 144.0
Included in earnings 2.0 4.0 3.0 16.0
Included in other comprehensive income (2.0) (1.0) (7.0) (2.0)
Purchases 41.0 25.0 68.0 26.0
Sales (8.0) (4.0) (31.0) (15.0)
Transfers in and (out) of Level 3 6.0 32.0 (28.0) 30.0
Ending balance 191.0 199.0 191.0 199.0
Exchange | Level 3 | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 86.0 26.0 100.0 31.0
Included in earnings 0.0 0.0 0.0 1.0
Included in other comprehensive income (2.0) (1.0) (7.0) (2.0)
Purchases 41.0 25.0 68.0 26.0
Sales (1.0) (1.0) (3.0) (5.0)
Transfers in and (out) of Level 3 6.0 32.0 (28.0) 30.0
Ending balance 130.0 81.0 130.0 81.0
Exchange | Level 3 | Trading securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 13.0 15.0 15.0 15.0
Included in earnings 0.0 0.0 (2.0) 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Sales 0.0 0.0 0.0 0.0
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 13.0 15.0 13.0 15.0
Exchange | Level 3 | Fixed maturities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 85.0 25.0 99.0 31.0
Included in earnings 0.0 0.0 0.0 1.0
Included in other comprehensive income (2.0) (1.0) (7.0) (2.0)
Purchases 41.0 25.0 68.0 25.0
Sales (1.0) (1.0) (3.0) (5.0)
Transfers in and (out) of Level 3 1.0 25.0 (33.0) 23.0
Ending balance 124.0 73.0 124.0 73.0
Exchange | Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 74.0 25.0 87.0 26.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income (2.0) (1.0) (7.0) (1.0)
Purchases 41.0 25.0 68.0 25.0
Sales (1.0) (1.0) (3.0) (2.0)
Transfers in and (out) of Level 3 1.0 23.0 (32.0) 23.0
Ending balance 113.0 71.0 113.0 71.0
Exchange | Level 3 | Collateralized debt obligations | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance   0.0   5.0
Included in earnings   0.0   1.0
Included in other comprehensive income   0.0   (1.0)
Purchases   0.0   0.0
Sales   0.0   (3.0)
Transfers in and (out) of Level 3   0.0   (2.0)
Ending balance   0.0   0.0
Exchange | Level 3 | Other debt securities | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 11.0 0.0 12.0 0.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Sales 0.0 0.0 0.0 0.0
Transfers in and (out) of Level 3 0.0 2.0 (1.0) 2.0
Ending balance 11.0 2.0 11.0 2.0
Exchange | Level 3 | Nonredeemable preferred stock | Available-for-sale securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1.0 1.0 1.0 0.0
Included in earnings 0.0 0.0 0.0 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 1.0
Sales 0.0 0.0 0.0 0.0
Transfers in and (out) of Level 3 5.0 7.0 5.0 7.0
Ending balance 6.0 8.0 6.0 8.0
Exchange | Level 3 | Common stock | Trading securities        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 13.0 15.0 15.0 15.0
Included in earnings 0.0 0.0 (2.0) 0.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Sales 0.0 0.0 0.0 0.0
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 13.0 15.0 13.0 15.0
Exchange | Level 3 | Real estate | Limited partnerships        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 53.0 102.0 71.0 98.0
Included in earnings 2.0 4.0 5.0 15.0
Included in other comprehensive income 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Sales (7.0) (3.0) (28.0) (10.0)
Transfers in and (out) of Level 3 0.0 0.0 0.0 0.0
Ending balance 48.0 $ 103.0 48.0 $ 103.0
Fair value measurements on a recurring basis | Indemnity | Real estate        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance     8.0  
Ending balance 5.0   5.0  
Fair value measurements on a recurring basis | Exchange | Real estate        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance     71.0  
Ending balance $ 48.0   $ 48.0