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Summary of Significant Accounting Policies (Narrative) (Details)
3 Months Ended 12 Months Ended
Jan. 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
landfill
Dec. 31, 2019
USD ($)
pension_plan
segment
landfill
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
segment
Oct. 01, 2019
Concentration Risk [Line Items]            
Net book credit balances in our primary disbursement accounts   $ 50,600,000 $ 50,600,000 $ 64,800,000    
Restricted cash and marketable securities   $ 179,400,000 179,400,000 108,100,000 $ 141,100,000  
Capitalized interest     $ 7,200,000 $ 6,800,000 $ 6,500,000  
Post-closure period     30 years      
Number of closed landfills | landfill   130 130      
Asset retirement obligation, costs to discharge, inflation rate     1.70% 1.70% 1.70%  
Years of historical moving average increase of the U.S. Consumer Price Index used as our basis for inflation rate     10 years      
Number of reportable segments | segment     2   2  
Future estimates of revenue and expense growth rate     3.00%      
Future estimated effective tax rates     27.00%      
Estimated discount rates, minimum range     6.00%      
Estimated discount rates, maximum range     8.00%      
Number of reporting units | segment     2      
Reporting unit, percentage of fair value in excess of carrying amount           140.00%
Number of qualified defined pension plans | pension_plan     1      
Right-of-use liability   $ 264,000,000.0 $ 264,000,000.0      
Right-of-use asset   243,600,000 243,600,000 $ 0    
Adoption of accounting standard $ 3,100,000          
Property and equipment, net   8,383,500,000 8,383,500,000 8,020,100,000    
Depreciation, amortization and depletion     1,040,500,000 1,033,400,000 $ 1,036,300,000  
Cash provided by operating activities     2,352,100,000 $ 2,242,800,000 $ 1,910,700,000  
Minimum            
Concentration Risk [Line Items]            
Interest capitalization, construction costs threshold     $ 50,000      
Interest capitalization, construction phase period     1 month      
Interest capitalization, useful life of assets under construction     1 year      
Amortization period for other intangible assets     1 year      
Maximum            
Concentration Risk [Line Items]            
Amortization period for other intangible assets     17 years      
Insurance Programs For Workers' Compensation            
Concentration Risk [Line Items]            
Restricted cash and marketable securities   99,400,000 $ 99,400,000      
Accounting Standards Update 2016-02            
Concentration Risk [Line Items]            
Right-of-use liability 256,300,000          
Right-of-use asset 236,200,000          
Adjustments for New Accounting Principle, Early Adoption            
Concentration Risk [Line Items]            
Property and equipment, net (28,700,000)          
Other assets $ 28,700,000          
Depreciation, amortization and depletion   $ 34,300,000        
Cash provided by operating activities     $ 10,900,000