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Debt - Schedule of Debt Obligations (Parenthetical) (Detail) $ in Millions, $ in Millions | Mar. 31, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Apr. 30, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt | 2.60% | 2.60% | 2.60% | 2.60% |
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 | 0.8 |  | 0.4 |  |
Foreign Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available capacity | $ 5.6 |  | $ 5.4 |  |
Foreign Line of Credit | Letter of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available capacity |  | $ 7.0 |  | $ 7.0 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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