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Related-Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions      
Premiums paid related to agreements $ 0.0    
Revenue from related party 612.7 $ 672.9 $ 723.8
Expenses from business transactions     0.2
Accounts receivable from affiliated entities 90.4 80.6  
James R Crane | Crane Capital Group Inc      
Related Party Transactions      
Expenses from business transactions 6.2 20.0 $ 17.1
Accounts payable to affiliated entities 0.8 2.4  
Management      
Related Party Transactions      
Premium payments to date related to life insurance policies 6.6    
Cash surrender value included in other long-term assets $ 5.5 $ 5.5