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Selected Quarterly Financial Data (unaudited) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Environmental Exit Cost [Line Items]    
Reduction of tax provision $ 464.0  
Bridgeton Closed Landfill    
Environmental Exit Cost [Line Items]    
Insurance recoveries   $ 40.0