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Reserves for Losses and Loss Adjustment Expenses - Short-duration Insurance Contracts, Claims Development by Accident Year (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Claim
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]            
Liability for claims and claims adjustment expenses, net of reinsurance $ 5,075.5          
Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 4,403.8          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,322.7          
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 2,081.1          
All outstanding liabilities before 2012, net of reinsurance 140.3          
Liability for claims and claims adjustment expenses, net of reinsurance 2,221.4          
Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 3,904.7          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,769.5          
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 2,135.2          
All outstanding liabilities before 2012, net of reinsurance 718.9          
Liability for claims and claims adjustment expenses, net of reinsurance 2,854.1          
Accident Year 2012 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 637.0 $ 656.7 $ 671.8 $ 657.6 $ 628.4 $ 606.9
Incurred but Not Reported (IBNR) Claims Liability, Net $ 47.2          
Number of Reported Claims | Claim 15,825          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 519.2 504.3 454.1 379.5 308.6 117.6
Accident Year 2012 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 683.8 692.8 694.2 723.7 740.0 695.5
Incurred but Not Reported (IBNR) Claims Liability, Net $ 93.4          
Number of Reported Claims | Claim 3,660          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 491.0 460.6 416.3 362.2 249.3 $ 63.6
Accident Year 2013 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 668.9 662.4 681.0 669.9 691.9  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 74.6          
Number of Reported Claims | Claim 14,728          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 503.1 456.2 365.9 255.3 91.1  
Accident Year 2013 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 519.5 528.6 554.8 575.9 583.2  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 92.9          
Number of Reported Claims | Claim 3,524          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 354.7 322.6 280.7 188.2 $ 63.6  
Accident Year 2014 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 686.2 704.8 732.7 758.1    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 109.7          
Number of Reported Claims | Claim 18,848          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 448.9 390.7 248.2 99.8    
Accident Year 2014 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 496.7 517.9 533.8 553.5    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 116.8          
Number of Reported Claims | Claim 3,440          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 281.8 249.6 173.5 $ 57.2    
Accident Year 2015 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 859.6 909.4 919.5      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 206.4          
Number of Reported Claims | Claim 21,142          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 459.5 328.0 119.5      
Accident Year 2015 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 553.5 568.6 584.8      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 166.5          
Number of Reported Claims | Claim 3,450          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 254.1 172.8 $ 57.7      
Accident Year 2016 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 876.3 912.7        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 316.0          
Number of Reported Claims | Claim 20,538          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 332.1 117.7        
Accident Year 2016 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 763.8 756.5        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 290.4          
Number of Reported Claims | Claim 3,032          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 297.4 $ 127.0        
Accident Year 2017 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 675.8          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 426.5          
Number of Reported Claims | Claim 10,694          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 59.9          
Accident Year 2017 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 887.4          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 636.9          
Number of Reported Claims | Claim 1,704          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 90.5