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Reserves for Losses and Loss Adjustment Expenses - Short-duration Insurance Contracts, Claims Development by Accident Year (Details)
$ in Millions
Jun. 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 $ 4,749.0          
Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 4,217.3          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,129.6          
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 2,087.7          
All outstanding liabilities before 2012, net of reinsurance 232.0          
Liability for claims and claims adjustment expenses, net of reinsurance 2,319.7          
Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 3,369.3          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,617.6          
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 1,751.7          
All outstanding liabilities before 2012, net of reinsurance 677.6          
Liability for claims and claims adjustment expenses, net of reinsurance 2,429.3          
Accident Year 2012 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 641.2 $ 653.2 $ 668.4 $ 654.4 $ 625.3 $ 603.4
Incurred but Not Reported (IBNR) Claims Liability, Net $ 53.8          
Number of Reported Claims | Claim 15,541          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 519.3 502.8 453.2 378.7 307.5 116.8
Accident Year 2012 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 683.6 688.8 690.1 719.6 736.0 691.5
Incurred but Not Reported (IBNR) Claims Liability, Net $ 101.2          
Number of Reported Claims | Claim 3,620          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 483.4 458.0 414.1 360.3 247.6 $ 63.2
Accident Year 2013 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 674.0 658.8 677.5 666.3 688.0  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 72.2          
Number of Reported Claims | Claim 14,461          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 473.4 455.2 364.0 253.8 90.4  
Accident Year 2013 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 514.9 522.9 548.8 570.0 577.5  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 100.5          
Number of Reported Claims | Claim 3,457          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 342.4 318.8 277.2 185.7 $ 63.0  
Accident Year 2014 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 717.2 700.0 727.8 753.0    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 152.2          
Number of Reported Claims | Claim 18,577          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 423.6 389.6 247.0 99.4    
Accident Year 2014 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 496.0 513.1 528.8 549.1    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 127.7          
Number of Reported Claims | Claim 3,316          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 271.9 247.6 172.0 $ 56.8    
Accident Year 2015 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 889.9 901.3 911.5      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 245.7          
Number of Reported Claims | Claim 20,566          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 427.5 325.6 118.8      
Accident Year 2015 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 553.5 563.2 579.7      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 185.3          
Number of Reported Claims | Claim 3,299          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 236.5 171.1 $ 57.3      
Accident Year 2016 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 889.3 905.2        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 351.4          
Number of Reported Claims | Claim 19,623          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 265.4 116.9        
Accident Year 2016 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 754.7 749.5        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 325.9          
Number of Reported Claims | Claim 2,764          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 249.4 $ 125.9        
Accident Year 2017 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 405.7          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 305.1          
Number of Reported Claims | Claim 5,979          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 20.4          
Accident Year 2017 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 366.6          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 258.3          
Number of Reported Claims | Claim 1,242          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 34.0