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Debt - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Aug. 31, 2021
USD ($)
extension
Nov. 30, 2020
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
CAD ($)
Feb. 28, 2023
USD ($)
Dec. 31, 2022
USD ($)
Aug. 31, 2022
USD ($)
May 31, 2022
USD ($)
Apr. 29, 2022
USD ($)
Jan. 31, 2022
USD ($)
Mar. 06, 2020
USD ($)
Feb. 29, 2020
USD ($)
Aug. 31, 2019
USD ($)
Debt Instrument [Line Items]                                    
Write-off of deferred issuance costs           $ 200,000                        
Letters of credit utilizing availability under our credit facilities $ 336,500,000     $ 336,500,000   336,500,000         $ 347,600,000              
Remaining borrowing capacity 1,986,100,000     1,986,100,000   1,986,100,000         1,402,400,000              
Loss on extinguishment of debt       0 $ 0 (200,000) $ 0                      
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, after tax       4,100,000 9,100,000 16,600,000 8,100,000                      
(Loss) gain on cash flow hedging relationships       2,300,000 0 7,100,000 (2,100,000)                      
Derivative assets, noncurrent 110,300,000     110,300,000   110,300,000         105,800,000              
Interest Rate Swap                                    
Debt Instrument [Line Items]                                    
Interest rate derivative liability at fair value                     1,200,000              
Gain (loss) on interest rate swaps       1,200,000 (1,000,000)   (6,200,000)                      
Freestanding Derviatives                                    
Debt Instrument [Line Items]                                    
Derivative liability                     1,000,000              
Freestanding Derviatives | Interest Expense                                    
Debt Instrument [Line Items]                                    
Gain (loss) on change in fair value of free standing derivatives       0 (800,000) 1,000,000 (5,200,000)                      
Net swap settlements                                    
Debt Instrument [Line Items]                                    
Gain (loss) on interest rate swaps         400,000 (2,200,000) 3,700,000                      
Hedged Senior Notes                                    
Debt Instrument [Line Items]                                    
Gain (loss) on interest rate swaps         100,000 (2,300,000) 4,100,000                      
Interest rate swap locks                                    
Debt Instrument [Line Items]                                    
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, after tax           (1,700,000)                        
Accumulated other comprehensive income (loss) (16,700,000)     (16,700,000)   (16,700,000)         (21,400,000)              
Effective portion of interest rate locks amortized as an adjustment to interest expense expected over the next twelve months           3,100,000                        
Interest rate swap locks | Interest Expense | Cash Flow Hedging                                    
Debt Instrument [Line Items]                                    
(Loss) gain on cash flow hedging relationships       (900,000) (1,100,000) (2,900,000) (3,200,000)                      
2022 interest rate swap                                    
Debt Instrument [Line Items]                                    
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, after tax       4,100,000 9,100,000 14,900,000 8,100,000                      
Accumulated other comprehensive income (loss) (10,000,000)     (10,000,000)   (10,000,000)         (5,100,000)              
2022 interest rate swap | Interest Expense | Cash Flow Hedging                                    
Debt Instrument [Line Items]                                    
(Loss) gain on cash flow hedging relationships       3,200,000 1,100,000 10,000,000 1,100,000                      
Extended Interest Rate Swaps                                    
Debt Instrument [Line Items]                                    
Derivative asset 87,200,000     87,200,000   87,200,000         69,800,000              
Terminated derivative, notional amount                                 $ 550,000,000.0 $ 375,000,000.0
Gain (loss) on change in fair value of free-standing derivative instruments       18,300,000 40,200,000 17,700,000 115,000,000                      
Offsetting Interest Rate Swap                                    
Debt Instrument [Line Items]                                    
Derivative liabilities 111,300,000     111,300,000   111,300,000         99,700,000              
Gain (loss) on change in fair value of free-standing derivative instruments       (18,900,000) $ (39,700,000) (19,600,000) $ (112,800,000)                      
Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Long-term debt 154,400,000     154,400,000   154,400,000         250,000,000              
Uncommitted Revolver                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity                             $ 200,000,000.0      
Principal 9,900,000     9,900,000   9,900,000         0              
Long-term debt 9,900,000     9,900,000   9,900,000         0              
Credit facilities: August 2026                                    
Debt Instrument [Line Items]                                    
Principal 154,400,000     154,400,000   154,400,000         250,000,000.0              
Long-term debt $ 154,400,000     $ 154,400,000   $ 154,400,000         250,000,000.0              
Canadian Sublimit | Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity                   $ 500,000,000                
Long-term debt                 $ 209.7                  
Interest rate 6.386%     6.386%   6.386%     6.386%                  
Credit facilities: Commercial Paper Facility                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity                       $ 1,000,000,000 $ 500,000,000          
Principal $ 523,000,000     $ 523,000,000   $ 523,000,000         1,000,000,000              
Long-term debt $ 522,800,000     $ 522,800,000   $ 522,800,000         998,200,000              
Weighted average interest rate 5.447%     5.447%   5.447%     5.447%                  
Credit facilities: Commercial Paper Facility | Weighted Average                                    
Debt Instrument [Line Items]                                    
Debt instrument, term           8 days                        
Term Loan Facility                                    
Debt Instrument [Line Items]                                    
Principal $ 700,000,000.0     $ 700,000,000.0   $ 700,000,000.0         1,000,000,000              
Long-term debt 700,000,000.0     700,000,000.0   700,000,000.0         1,000,000,000              
Interest rate                               0.832%    
Term Loan Facility | 2022 interest rate swap                                    
Debt Instrument [Line Items]                                    
Derivative assets, noncurrent 33,600,000     33,600,000   33,600,000         36,000,000              
Term Loan Facility | 2022 interest rate swap | Forecast                                    
Debt Instrument [Line Items]                                    
Effective portion of interest rate locks amortized as an adjustment to interest expense expected over the next twelve months               $ 7,000,000                    
Term Loan Facility | US Ecology | 2022 interest rate swap                                    
Debt Instrument [Line Items]                                    
Derivative, notional amount 360,000,000     360,000,000   360,000,000                   $ 500,000,000    
Derivative asset                               $ 29,100,000    
Senior notes: May 2023                                    
Debt Instrument [Line Items]                                    
Principal 0     0   0         300,000,000.0              
Long-term debt $ 0     $ 0   $ 0         297,500,000              
Interest rate 4.75%     4.75%   4.75%     4.75%                  
Extinguishment of debt, amount     $ 250,000,000.0                              
Senior notes: March 2023                                    
Debt Instrument [Line Items]                                    
Interest rate 5.00%     5.00%   5.00%     5.00%                  
Senior notes: March 2030                                    
Debt Instrument [Line Items]                                    
Principal $ 600,000,000.0     $ 600,000,000.0   $ 600,000,000.0         600,000,000.0              
Long-term debt $ 595,300,000     $ 595,300,000   $ 595,300,000         594,800,000              
Interest rate 2.30%     2.30%   2.30%     2.30%                  
Senior notes: August 2024                                    
Debt Instrument [Line Items]                                    
Principal $ 900,000,000.0     $ 900,000,000.0   $ 900,000,000.0         900,000,000.0              
Long-term debt $ 898,300,000     $ 898,300,000   $ 898,300,000         897,000,000.0              
Interest rate 2.50%     2.50%   2.50%     2.50%                  
Tax-exempt financings                                    
Debt Instrument [Line Items]                                    
Principal $ 1,289,100,000     $ 1,289,100,000   $ 1,289,100,000         1,189,100,000              
Long-term debt 1,280,500,000     1,280,500,000   1,280,500,000         1,182,000,000              
Solid Waste Disposal Revenue Bonds                                    
Debt Instrument [Line Items]                                    
Principal $ 100,000,000     100,000,000   100,000,000                        
Debt instrument, term 10 years                                  
Finance leases                                    
Debt Instrument [Line Items]                                    
Present value of lease liabilities $ 254,600,000     $ 254,600,000   $ 254,600,000         $ 247,500,000              
Line of Credit | Revolving Credit Facility                                    
Debt Instrument [Line Items]                                    
Number of available extensions | extension   2                                
Extension period   1 year                                
Facility feature, increase limit   $ 1,000,000,000                                
Basis spread           0.91%                        
Line of Credit | Credit facilities: August 2026                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity   $ 3,000,000,000                                
Term Loan Facility                                    
Debt Instrument [Line Items]                                    
Principal face amount of debt issued                           $ 1,000,000,000        
Term Loan Facility | US Ecology                                    
Debt Instrument [Line Items]                                    
Weighted average interest rate                           6.216%