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Related Party Transactions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
affiliate
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
affiliate
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]          
Number of affiliates in reinsurance agreements | affiliate 2   2    
Other Affiliates          
Related Party Transaction [Line Items]          
Revenue with affiliated entities $ 109.5 $ 138.8 $ 257.3 $ 274.1  
Expenses with affiliated entities 177.5 $ 195.6 378.9 $ 391.3  
Affiliated Entity          
Related Party Transaction [Line Items]          
Deposit assets 74.2   74.2   $ 80.4
Deposit liabilities $ 158.4   $ 158.4   $ 172.0