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Life, Accident and Health Reserves - Liability for Claims of Long-Term Care Insurance Reserves (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning balance $ 4,562.1      
Paid related to insured events of:        
Ending balance 4,536.6      
Other Long Duration Insurance Product Line        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning balance 738.7 $ 243.5    
Less: recoverable from reinsurers (136.4) (100.6)    
Beginning balance, net 603.6 157.9 $ 602.3 $ 142.9
Incurred related to insured events of:        
Current year 108.8 36.4    
Prior years (41.2) 2.6    
Total incurred 67.6 39.0    
Paid related to insured events of:        
Current year (2.9) (1.4)    
Prior years (74.1) (25.2)    
Total paid (77.0) (26.6)    
Interest on liability for policy and contract claims 10.7 2.6    
Ending balance, net 603.6 157.9    
Add: recoverable from reinsurers 137.4 106.4    
Ending balance $ 741.0 $ 264.3