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Dividend Restrictions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
May 31, 2019
Jan. 01, 2019
U.K. [Member]            
Statutory Accounting Practices [Line Items]            
Dividends declared $ 85.0   $ 79.5      
NEW HAMPSHIRE            
Statutory Accounting Practices [Line Items]            
Percentage of policyholder's surplus distributes as dividends and other distributions 10.00%          
Dividends declared $ 140.0 $ 296.8 218.8      
Dividends paid to parent $ 140.0 296.8 218.8      
Payment of extraordinary dividends   80.0        
NEW HAMPSHIRE | Scenario, Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Statutory amount available for dividend payments         $ 216.7  
NEW HAMPSHIRE | Maximum [Member] | Scenario, Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Maximum dividends payable without prior approval of state regulators         $ 140.0 $ 76.7
MICHIGAN            
Statutory Accounting Practices [Line Items]            
Percentage of policyholder's surplus distributes as dividends and other distributions 10.00%          
Dividends declared $ 87.9 $ 99.9 $ 70.0      
MICHIGAN | Scenario, Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Statutory amount available for dividend payments       $ 107.1    
MICHIGAN | Maximum [Member] | Scenario, Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Maximum dividends payable without prior approval of state regulators       $ 19.2   $ 87.9