XML 44 R32.htm IDEA: XBRL DOCUMENT v3.20.2
Basis of Presentation Basis of Presentation-Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Business Acquisition [Line Items]        
Assets held-for-sale $ 27.1 $ 27.1 $ 32.9 $ 43.7
Operating lease, right-of-use asset 174.1 174.1 188.2 190.5
Operating lease, liability $ 186.2 $ 186.2 $ 201.5 $ 204.1
Operating lease right-of-use asset, balance sheet location us-gaap:OtherAssets us-gaap:OtherAssets    
Operating lease liability location on balance sheet us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Premium Receivable, Allowance for Credit Loss, Beginning Balance $ 437.9 $ 283.2    
Increase in premiums receivable, allowance for doubtful accounts (3.6) 362.9    
Reduction of premiums receivable, allowance for doubtful accounts (121.1) (332.9)    
Premium Receivable, Allowance for Credit Loss, Ending Balance $ 313.2 $ 313.2    
ARX Holding Corp.        
Business Acquisition [Line Items]        
Percentage ownership 100.00% 100.00% 87.10% 87.10%