XML 66 R51.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Debt - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Aug. 31, 2021
USD ($)
extension
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Oct. 31, 2023
USD ($)
Feb. 28, 2023
USD ($)
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]                                
Letters of credit utilizing availability under our credit facilities     $ 332,800,000       $ 336,500,000                  
Remaining borrowing capacity     2,495,300,000       2,371,200,000                  
Loss on extinguishment of debt     0 $ 200,000                        
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, after tax     5,100,000 5,200,000                        
(Loss) gain on cash flow hedging relationships     2,100,000 2,600,000                        
Derivative assets, noncurrent     87,900,000       74,100,000                  
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)     (15,000,000.0)       (15,900,000)                  
Effective portion of interest rate locks amortized as an adjustment to interest expense expected over the next twelve months     2,000,000                          
Interest rate swap locks | Interest Expense | Cash Flow Hedging                                
Debt Instrument [Line Items]                                
(Loss) gain on cash flow hedging relationships     (900,000) (1,000,000.0)                        
2022 interest rate swap                                
Debt Instrument [Line Items]                                
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, after tax     5,100,000 3,500,000                        
Accumulated other comprehensive income (loss)     (6,400,000)       (4,300,000)                  
2022 interest rate swap | Interest Expense | Cash Flow Hedging                                
Debt Instrument [Line Items]                                
(Loss) gain on cash flow hedging relationships     3,000,000.0 3,600,000                        
Extended Interest Rate Swaps                                
Debt Instrument [Line Items]                                
Derivative asset     67,400,000       54,000,000                  
Terminated derivative, notional amount                             $ 550,000,000.0 $ 375,000,000.0
Net gain (loss) on change in fair value of free-standing derivative instruments     13,600,000 (9,800,000)                        
Offsetting Interest Rate Swap                                
Debt Instrument [Line Items]                                
Derivative liabilities     87,800,000       78,200,000                  
Net gain (loss) on change in fair value of free-standing derivative instruments     (13,600,000) $ 8,700,000                        
Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Long-term debt     $ 162,900,000       297,100,000                  
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%                          
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                       6.227%        
Uncommitted Revolver                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity                         $ 200,000,000.0      
Principal     $ 24,200,000       0                  
Long-term debt     24,200,000       0                  
Credit facilities: August 2026                                
Debt Instrument [Line Items]                                
Principal     162,900,000       297,100,000                  
Long-term debt     $ 162,900,000       297,100,000                  
Credit facilities: August 2026 | Line of Credit                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity   $ 3,000,000,000.0             $ 3,500,000,000              
Canadian Sublimit | Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity                 1,000,000,000.0 $ 500,000,000            
Long-term debt           $ 220.6   $ 201.5                
Interest rate     6.225%     6.225%                    
Credit facilities: Commercial Paper Facility                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity                 $ 1,500,000,000   $ 500,000,000          
Principal     $ 509,000,000.0       496,000,000.0                  
Long-term debt     $ 508,300,000       495,300,000                  
Weighted average interest rate     5.483%     5.483%                    
Credit facilities: Commercial Paper Facility | Weighted Average                                
Debt Instrument [Line Items]                                
Debt instrument, term     18 days                          
Term Loan Facility                                
Debt Instrument [Line Items]                                
Principal     $ 500,000,000       500,000,000.0                  
Long-term debt     500,000,000.0       500,000,000.0                  
Interest rate                           0.832%    
Term Loan Facility | 2022 interest rate swap                                
Debt Instrument [Line Items]                                
Derivative assets, noncurrent     25,600,000       24,300,000                  
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         $ 5,000,000                      
Term Loan Facility | US Ecology | 2022 interest rate swap                                
Debt Instrument [Line Items]                                
Derivative, notional amount     340,000,000                     $ 500,000,000    
Derivative asset                           $ 29,100,000    
Senior notes: April 2029                                
Debt Instrument [Line Items]                                
Principal     750,000,000.0       750,000,000.0                  
Long-term debt     $ 743,100,000       $ 743,100,000                  
Interest rate     4.875% 4.875%   4.875% 4.875% 4.875%                
Senior Notes Due April 2029 March Issuance                                
Debt Instrument [Line Items]                                
Principal       $ 400,000,000                        
Senior Notes Due April 2029 December Issuance                                
Debt Instrument [Line Items]                                
Principal             $ 350,000,000                  
Senior notes: March 2023                                
Debt Instrument [Line Items]                                
Interest rate       5.00%                        
Senior notes: March 2030                                
Debt Instrument [Line Items]                                
Principal     $ 600,000,000.0       600,000,000.0                  
Long-term debt     $ 595,600,000       595,500,000                  
Interest rate     2.30%     2.30%                    
Senior notes: August 2024                                
Debt Instrument [Line Items]                                
Principal     $ 900,000,000.0       900,000,000.0                  
Long-term debt     $ 899,300,000       898,800,000                  
Interest rate     2.50%     2.50%                    
Tax-exempt financings                                
Debt Instrument [Line Items]                                
Principal     $ 1,389,100,000       1,289,100,000                  
Long-term debt     1,379,800,000       1,280,600,000                  
Solid Waste Disposal Revenue Bonds                                
Debt Instrument [Line Items]                                
Principal $ 100,000,000   100,000,000                          
Debt instrument, term 10 years                              
Finance leases                                
Debt Instrument [Line Items]                                
Present value of lease liabilities     $ 259,000,000.0       $ 251,300,000