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Employee Retirement Plans (Multiemployer Pension Plans) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
plan
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Multiemployer Plans [Line Items]      
Number of underfunded plans | plan 2    
Withdrawal obligation $ 37.0    
Payments to multiemployer pension plans 9.4 $ 7.8  
Other Long-Term Liabilities      
Multiemployer Plans [Line Items]      
Withdrawal obligation 33.1   $ 35.7
Other Current Liabilities      
Multiemployer Plans [Line Items]      
Withdrawal obligation $ 3.9   $ 8.4