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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Reinsurance [Line Items]        
Restricted cash and cash equivalents $ 347.6 $ 255.6 $ 273.6 $ 224.7
Restricted securities available for sale [1] 56.7 46.1    
Accounts payable and accrued liabilities 167.9 151.7    
Trust Assets [Member]        
Reinsurance [Line Items]        
Restricted cash and cash equivalents 0.7 0.8    
Restricted securities available for sale 56.7 46.1    
Unearned Premium [Member]        
Reinsurance [Line Items]        
Accounts payable and accrued liabilities 43.2 34.1    
Claims Reserve [Member]        
Reinsurance [Line Items]        
Accounts payable and accrued liabilities [2] $ 1.7 $ 1.0    
[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmZjOGQ1MTk3NTBkNzRkNDQ4OGM0NDEyMmU4YzVmYzEyfFRleHRTZWxlY3Rpb246N0Q5OEM5OURCMDgwOTUzOUI0NjAxOUVBNThDQUJDRjMM}
[2] The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.