v3.5.0.2
Landfill and Environmental Costs - Narrative (Details)
$ in Millions, ft³ in Billions
 9 Months Ended
Sep. 30, 2016
USD ($)
landfill
ft³
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Environmental Exit Cost [Line Items]        
Number of active solid waste landfills | landfill 192      
Total available disposal capacity (billion in-place cubic feet) | ft³ 135      
Number of closed landfills | landfill 124      
Fair value of assets that are legally restricted for final capping, closure and post-closure obligations $ 27.8   $ 27.3  
Amount of aggregate potential remediation liability 350.0      
Payments for management and monitoring of remediation area 50.7 $ 50.1    
Remediation liability 615.1 $ 667.6 $ 646.1 $ 697.5
Bridgeton Landfill        
Environmental Exit Cost [Line Items]        
Payments for management and monitoring of remediation area 17.9      
Remediation liability 199.6      
Remediation liability expected to be paid during the remainder of 2016 7.0      
Bridgeton Landfill | Maximum        
Environmental Exit Cost [Line Items]        
Range of loss for remediation costs (maximum) $ 164.0