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Subsequent Events (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 07, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]        
Long-term Debt, Gross   $ 4,780.4 $ 4,429.7  
Segment Profit Loss   $ 466.2 447.3 $ 450.3
Noncontrolling Interest, Ownership Percentage by Parent   10.00%    
ASC [Member]        
Subsequent Event [Line Items]        
Segment Profit Loss   $ 46.1 $ 33.0 $ 24.5
Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability   $ 10.5    
Noncontrolling Interest, Ownership Percentage by Parent   3.50%    
ASC [Member] | Sale of Stock [Domain]        
Subsequent Event [Line Items]        
Stock repurchase agreement, purchase price $ 260.0