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Borrowings - North American Revolving Credit and Term Loan (Details)
6 Months Ended
Jul. 31, 2020
Jun. 30, 2020
USD ($)
Credit Agreement    
Debt Instrument [Line Items]    
Unused commitment fee   0.375%
Maximum cash dividends   $ 20,000,000.0
Stock repurchases authorized amount   $ 100,000,000.0
Credit Agreement | End Of June 30, 2020    
Debt Instrument [Line Items]    
Credit agreement consolidated leverage ratio   2.75
Credit Agreement | After June 30, 2020 Through December 31, 2020    
Debt Instrument [Line Items]    
Credit agreement consolidated leverage ratio   3.25
Credit Agreement | Ending After December 31, 2020    
Debt Instrument [Line Items]    
Credit agreement consolidated leverage ratio   3.0
North American Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 1,538,000,000.0
Unused portion   562,300,000
Current borrowing capacity   $ 313,600,000
Consolidated Senior Secured Leverage | Credit Agreement | End Of Any Fiscal Quarter Until March 31, 2021    
Debt Instrument [Line Items]    
Credit agreement consolidated leverage ratio   2.75
Consolidated Senior Secured Leverage | Credit Agreement | March 31, 2021 Until Maturity    
Debt Instrument [Line Items]    
Credit agreement consolidated leverage ratio   2.25
Unsecured Debt | Senior Unsecured Debt other than Convertible Notes Due 2020    
Debt Instrument [Line Items]    
Maximum allowable debt   $ 750,000,000.0
Eurodollar Rate    
Debt Instrument [Line Items]    
Basis spread variable rate   1.00%
Eurodollar Rate | Credit Agreement    
Debt Instrument [Line Items]    
Basis spread variable rate   2.50%
Base Rate | Credit Agreement    
Debt Instrument [Line Items]    
Basis spread variable rate   1.50%
Additional basis points added to margin   55.00%
Federal Funds Rate    
Debt Instrument [Line Items]    
Basis spread variable rate   0.50%
Canadian Prime Rate    
Debt Instrument [Line Items]    
Basis spread variable rate   1.50%
Interest Rate Floor    
Debt Instrument [Line Items]    
Basis spread variable rate   1.00%
Line of Credit | Line of Credit    
Debt Instrument [Line Items]    
Long-term debt   $ 420,000,000.0
Revolving Credit Facility | North American Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity   1,068,000,000.0
Line of credit facility, optional increase in borrowing capacity   500,000,000.0
Line of credit facility, option for letters of credit   25,000,000.0
Line of credit facility, option to reduce borrowing capacity   25,000,000.0
Canadian Revolving Credit Facility | North American Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity   50,000,000.0
Acquisition Subsequent to 2014 | Credit Agreement    
Debt Instrument [Line Items]    
Maximum business combinations   250,000,000.0
Maximum business combinations, non-loan   $ 50,000,000.0
Eligible Core Asset Pool | Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of eligible asset pools   35.00%
Eligible Core Asset Pool | Credit Agreement | Subsequent Event    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of eligible asset pools 40.00%  
Eligible Insolvent Asset Pool | Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of insolvent asset pools   55.00%
Eligible Accounts Receivable | Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of eligible accounts receivable   75.00%