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Insurance Operations (Tables)
 12 Months Ended
Dec. 31, 2019
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 2019, 2018 and 2017 related to the wholly-owned underwriting enterprise subsidiary discussed above are as follows (in millions):
                                                 
 
2019
   
2018
   
2017
 
 
Written
 
  
Earned
 
  
Written
 
  
Earned
 
  
Written
 
  
Earned
 
Direct
  $
44.6
    $
59.1
    $
57.6
    $
53.2
    $
60.7
    $
60.4
 
Assumed
   
1.0
     
1.9
     
4.7
     
4.6
     
5.0
     
4.5
 
Ceded
   
(45.6
 )    
(61.0
 )    
(62.3
 )    
(57.8
 )    
(65.7
 )    
(64.9
 )
                                                 
Net
  $
—  
     $
—  
     $
—  
     $
—  
     $
—  
     $
—