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LONG-TERM DEBT - Summary of Long-Term Debt (Detail) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	May 30, 2018 USD ($)
Debt Instrument [Line Items]
Total debt - principal	$ 3,271,969,000	$ 2,258,873,000
Less unamortized debt issuance costs and debt discount	20,716,000	14,452,000
Total debt	3,251,253,000	2,244,421,000
Less current portion	28,036,000	29,813,000
Long-term debt	3,223,217,000	2,214,608,000
Bank Debt
Debt Instrument [Line Items]
Total debt - principal	930,407,000	795,830,000
Finance leases
Debt Instrument [Line Items]
Total debt - principal	34,480,000	33,288,000
Bank revolving loans | Bank Debt
Debt Instrument [Line Items]
Total debt - principal	0	0
U.S. term loans
Debt Instrument [Line Items]
Total debt - principal				$ 800,000,000.0
U.S. term loans | Bank Debt
Debt Instrument [Line Items]
Total debt - principal	900,000,000	760,000,000
Canadian term loans
Debt Instrument [Line Items]
Total debt - principal				$ 45,500,000
Canadian term loans | Bank Debt
Debt Instrument [Line Items]
Total debt - principal	0	4,703,000	$ 6.1
Other foreign bank revolving and term loans | Bank Debt
Debt Instrument [Line Items]
Total debt - principal	30,407,000	31,127,000
Senior Notes | 4¾% Senior Notes
Debt Instrument [Line Items]
Total debt - principal	$ 300,000,000	300,000,000
Stated interest rate	4.75%
Senior Notes | 3¼% Senior Notes
Debt Instrument [Line Items]
Total debt - principal	$ 795,307,000	729,755,000
Stated interest rate	3.25%
Senior Notes | 4⅛% Senior Notes
Debt Instrument [Line Items]
Total debt - principal	$ 600,000,000	400,000,000
Stated interest rate	4.125%
Senior Notes | 2¼% Senior Notes
Debt Instrument [Line Items]
Total debt - principal	$ 611,775,000	$ 0
Stated interest rate	2.25%

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Debt Long Term and Short Term Less Unamortized Debt Issuance Expense Combined Amount

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Topic 210
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