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Debt - Schedule of Debt Obligations (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Apr. 30, 2018
USD ($)
Term Debt [Member]          
Debt Instrument [Line Items]          
Interest rate on debt 2.60% 2.60% 4.80% 4.80%  
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Available capacity $ 300.0   $ 300.0   $ 300.0
Revolving Credit Facility [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Available capacity 0.4   1.9    
Canada Line of Credit [Member]          
Debt Instrument [Line Items]          
Available capacity $ 5.4 $ 7.0 $ 5.4 $ 7.0