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Insurance Operations (Tables)
 12 Months Ended
Dec. 31, 2018
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 2018, 2017 and 2016 related to the wholly-owned underwriting enterprise subsidiary discussed above are as follows (in millions):

 

     2018     2017     2016  
     Written     Earned     Written     Earned     Written     Earned  

Direct

    $ 57.6     $ 53.2     $ 60.7     $ 60.4     $ 71.8     $ 69.6  

Assumed

      4.7       4.6       5.0       4.5       5.2       4.9  

Ceded

      (62.3 )      (57.8 )      (65.7 )      (64.9 )      (77.0 )      (74.5 ) 
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

  

Net

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