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Reserves for Losses and Loss Adjustment Expenses - Short-duration Insurance Contracts, Claims Development by Accident Year (Details)
$ in Millions
Mar. 31, 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 $ 4,694.6          
Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 3,998.2          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,952.8          
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 2,045.4          
All outstanding liabilities before 2012, net of reinsurance 211.2          
Liability for claims and claims adjustment expenses, net of reinsurance 2,256.6          
Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 3,175.6          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,447.8          
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 1,727.8          
All outstanding liabilities before 2012, net of reinsurance 710.2          
Liability for claims and claims adjustment expenses, net of reinsurance 2,438.0          
Accident Year 2012 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 644.7 $ 649.0 $ 664.1 $ 650.5 $ 621.6 $ 599.2
Incurred but Not Reported (IBNR) Claims Liability, Net $ 58.1          
Number of Reported Claims | Claim 15,513          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 505.1 497.9 448.4 374.9 305.1 115.7
Accident Year 2012 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 681.0 683.6 684.8 714.3 730.9 686.3
Incurred but Not Reported (IBNR) Claims Liability, Net $ 103.3          
Number of Reported Claims | Claim 3,566          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 471.2 454.6 410.9 357.4 245.3 $ 62.7
Accident Year 2013 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 659.7 654.6 673.4 662.2 683.5  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 98.5          
Number of Reported Claims | Claim 14,415          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 459.6 451.0 361.7 252.0 89.5  
Accident Year 2013 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 510.9 515.2 540.7 561.8 569.6  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 108.2          
Number of Reported Claims | Claim 3,356          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 321.6 313.5 272.3 181.9 $ 62.1  
Accident Year 2014 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 701.5 696.4 723.9 749.2    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 153.5          
Number of Reported Claims | Claim 18,459          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 400.7 386.8 245.5 98.9    
Accident Year 2014 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 499.4 506.9 522.5 543.4    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 142.1          
Number of Reported Claims | Claim 3,183          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 255.7 244.9 169.8 $ 56.3    
Accident Year 2015 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 879.5 895.3 906.1      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 261.7          
Number of Reported Claims | Claim 20,271          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 386.9 322.9 118.0      
Accident Year 2015 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 539.9 556.2 573.5      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 197.0          
Number of Reported Claims | Claim 3,088          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 210.6 168.8 $ 56.7      
Accident Year 2016 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 919.1 899.0        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 417.6          
Number of Reported Claims | Claim 18,879          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 197.3 116.0        
Accident Year 2016 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 768.0 741.1        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 406.4          
Number of Reported Claims | Claim 2,415          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 177.1 $ 124.9        
Accident Year 2017 | Insurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 193.7          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 165.0          
Number of Reported Claims | Claim 2,561          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 3.2          
Accident Year 2017 | Reinsurance            
Claims Development [Line Items]            
Incurred Claims and Allocated Claim Adjustment Expense, Net 176.4          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 141.6          
Number of Reported Claims | Claim 849,000,000          
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11.6