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Insurance Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Insurance [Abstract]  
Summary of Reconciliations of Direct to Net premiums on Written and Earned Basis Related to Wholly Owned Underwriting Enterprise Subsidiary

Reconciliations of direct to net premiums, on a written and earned basis, for 2017, 2016 and 2015 related to the wholly-owned underwriting enterprise subsidiary discussed above are as follows (in millions):

 

     2017     2016     2015  
     Written     Earned     Written     Earned     Written     Earned  

Direct

    $ 60.7     $ 60.4     $ 71.8     $ 69.6     $ 71.5     $ 71.7  

Assumed

      5.0       4.5       5.2       4.9       4.4       5.1  

Ceded

      (65.7 )      (64.9 )      (77.0 )      (74.5 )      (75.9 )      (76.8 ) 
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

  

Net

    $ —       $ —       $ —       $ —       $ —       $ —