XML 50 R74.htm IDEA: XBRL DOCUMENT v3.20.1
Fair Value Measurements - Reconciliation of Level 3 Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Liability for unpaid claims and claims adjustment expense amount ceded   $ (125.5)  
Amount classified within accrued expenses and other payables $ (5.7)   $ 0.0
Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Instrument, Accrued Interest and Payables, Fair Value Disclosure 4.6   0.0
Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Instrument, Accrued Interest and Payables, Fair Value Disclosure 4.6   0.0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at the beginning of the period 86.6    
Balance at the end of the period 4.6 $ 86.6  
Silverton 2016 | Recurring | Level 3      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Distributed to third parties (86.4)    
Balance at the end of the period 4.6    
Third party      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Amount classified within accrued expenses and other payables $ (4.6)   $ 0.0