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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, 2018
USD ($)
Claim
Dec. 31, 2017
USD ($)
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 $ 4,830.5            
Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 4,884.2            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,885.9            
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 1,998.3            
All outstanding liabilities before 2012, net of reinsurance 114.0            
Liability for claims and claims adjustment expenses, net of reinsurance 2,112.3            
Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 4,521.2            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,422.9            
All outstanding liabilities for 2012 and subsequent years, net of reinsurance 2,098.3            
All outstanding liabilities before 2012, net of reinsurance 619.9            
Liability for claims and claims adjustment expenses, net of reinsurance 2,718.2            
Accident Year 2012 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 647.2 $ 638.2 $ 654.7 $ 669.9 $ 655.9 $ 626.8 $ 605.0
Incurred but Not Reported (IBNR) Claims Liability, Net $ 45.9            
Number of Reported Claims | Claim 15,682            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 531.7 524.7 502.8 452.9 378.5 307.9 117.3
Accident Year 2012 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 686.7 687.9 689.4 690.6 720.9 737.3 692.8
Incurred but Not Reported (IBNR) Claims Liability, Net $ 71.2            
Number of Reported Claims | Claim 3,838            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 511.4 496.5 458.7 414.8 360.9 248.2 $ 63.2
Accident Year 2013 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 651.1 650.6 660.4 679.0 667.9 689.6  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 32.4            
Number of Reported Claims | Claim 14,631            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 532.7 502.8 455.0 364.9 254.5 90.7  
Accident Year 2013 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 499.7 504.9 524.3 550.2 572.2 579.6  
Incurred but Not Reported (IBNR) Claims Liability, Net $ 66.2            
Number of Reported Claims | Claim 3,689            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 371.6 359.9 320.1 278.4 186.8 $ 63.2  
Accident Year 2014 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 699.5 695.1 702.4 730.1 755.6    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 68.0            
Number of Reported Claims | Claim 18,836            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 481.0 465.9 389.8 247.5 99.5    
Accident Year 2014 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 477.5 487.1 514.2 529.9 550.6    
Incurred but Not Reported (IBNR) Claims Liability, Net $ 82.8            
Number of Reported Claims | Claim 3,696            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 308.1 289.2 248.5 172.6 $ 57.0    
Accident Year 2015 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 858.1 855.1 905.9 916.0      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 154.4            
Number of Reported Claims | Claim 21,132            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 523.4 471.9 326.9 119.2      
Accident Year 2015 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 536.9 558.2 564.5 580.3      
Incurred but Not Reported (IBNR) Claims Liability, Net $ 117.6            
Number of Reported Claims | Claim 3,899            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 306.2 272.1 171.4 $ 57.5      
Accident Year 2016 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 873.6 881.6 909.3        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 284.6            
Number of Reported Claims | Claim 21,052            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 415.4 346.1 117.3        
Accident Year 2016 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 768.9 762.8 749.1        
Incurred but Not Reported (IBNR) Claims Liability, Net $ 218.1            
Number of Reported Claims | Claim 3,709            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 400.0 350.7 $ 125.5        
Accident Year 2017 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 847.7 896.1          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 175.9            
Number of Reported Claims | Claim 20,622            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 369.5 167.8          
Accident Year 2017 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 1,189.0 1,190.2          
Incurred but Not Reported (IBNR) Claims Liability, Net $ 420.5            
Number of Reported Claims | Claim 3,746            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 508.1 $ 227.9          
Accident Year 2018 | Insurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 307.0            
Incurred but Not Reported (IBNR) Claims Liability, Net $ 192.9            
Number of Reported Claims | Claim 6,929            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 32.2            
Accident Year 2018 | Reinsurance              
Claims Development [Line Items]              
Incurred Claims and Allocated Claim Adjustment Expense, Net 362.5            
Incurred but Not Reported (IBNR) Claims Liability, Net $ 289.9            
Number of Reported Claims | Claim 1,415            
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 17.5