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Commitments and Contingencies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Losses accrued related to legal proceedings $ 48,000,000    
Loss contingency additional potential liability 45,000,000    
Rent expense 56,800,000 $ 53,600,000 $ 49,100,000
Letter of credit $ 210,000,000 0  
Percentage of ownership interest in company 19.90%    
Outstanding amount for land fill operations $ 1,225,500,000    
Letters of credit outstanding 0 0  
Letter of credit      
Debt Instrument [Line Items]      
Letter of credit $ 478,400,000 $ 503,300,000  
Minimum      
Debt Instrument [Line Items]      
Lease agreement, remaining terms 1 month    
Maximum      
Debt Instrument [Line Items]      
Lease agreement, remaining terms 30 years