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Long-Term Debt - Summary of Long-Term Debt (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Feb. 13, 2017
Sep. 09, 2013
Mar. 23, 2012
USD ($)
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   $ 2,258,873   $ 2,317,723      
Unamortized Debt Issuance Costs   14,452   13,109      
Total debt   2,244,421   2,304,614      
Less current portion   29,813   170,214      
Long-term debt   2,214,608   2,134,400      
Long-term debt, due in the next twelve months   27,877          
Long-term Debt, Maturities, Repayments of Principal in 2021   3,250          
Long-term Debt, Maturities, Repayments of Principal in 2022   0          
Long-term Debt, Maturities, Repayments of Principal in 2023   0          
Long-term Debt, Maturities, Repayments of Principal in 2024   13,547          
Long-term Debt, Maturities, Repayments of Principal in 2025 and Thereafter   2,180,911          
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   2,225,585          
Four and One Eighth Percent Senior Notes Due 2028 [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   400,000   0      
Finance Leases [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   33,288   21,543      
Three and One Quarter Percent Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   729,755   744,380      
Bank Borrowings [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   795,830   951,800      
Four and Three Quarters Percent Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   300,000   300,000      
Bank revolving loans [Member] | Bank Borrowings [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   0   0      
U.S. term loans [Member] | Bank Borrowings [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   760,000   800,000      
Long-term debt   80,000          
Canadian Term Loans [Member] | Bank Borrowings [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases $ 6.1 4,703 $ 30.1 22,103      
Other Foreign Bank Revolving And Term Loans [Member]              
Debt Instrument [Line Items]              
Long-term debt, due in the next twelve months   27,900          
Other Foreign Bank Revolving And Term Loans [Member] | Bank Borrowings [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   $ 31,127   129,697      
Senior Notes [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]              
Debt Instrument [Line Items]              
Stated interest rate 4.125% 4.125%          
Senior Notes [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Stated interest rate 3.25% 3.25%          
Senior Notes [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Stated interest rate 4.75% 4.75%          
5½% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   $ 0   300,000      
Stated interest rate           5.50%  
5% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases             $ 500,000
Stated interest rate             5.00%
Three and One Quarter Percent Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Stated interest rate         3.25%    
Four and Three Quarters Percent Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Stated interest rate         4.75%    
Term Loan [Member] | Bank Borrowings [Member]              
Debt Instrument [Line Items]              
Debt, Long-term and short-term, Combined Amount excluding Finance Leases   $ 764,700   $ 822,100