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Derivatives - Summary of Various Interest Rate Hedges (Detail) - Incremental Term Loan Facility [Member] - Interest Rate Hedge [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Fair Value Asset (Liability) | $ (14.0) | $ (5.7)
Swap Agreement One [Member] |  |
Derivative [Line Items] |  |
Trade Date | Sep. 29, 2016 |
Effective Date | Sep. 30, 2016 |
Maturity | Sep. 30, 2020 |
Fixed Rate | 1.198% |
Notional Amount at Effective Date | $ 335.0 |
Fair Value Asset (Liability) |  | 0.8
Swap Agreement Two [Member] |  |
Derivative [Line Items] |  |
Trade Date | Apr. 03, 2019 |
Effective Date | Apr. 05, 2019 |
Maturity | Mar. 31, 2023 |
Fixed Rate | 2.309% |
Notional Amount at Effective Date | $ 300.0 |
Fair Value Asset (Liability) | $ (12.4) | $ (6.5)
Swap Agreement Three [Member] |  |
Derivative [Line Items] |  |
Trade Date | Oct. 29, 2020 |
Effective Date | Oct. 26, 2021 |
Maturity | Feb. 28, 2025 |
Fixed Rate | 0.485% |
Notional Amount at Effective Date | $ 200.0 |
Fair Value Asset (Liability) | $ (0.7) |
Swap Agreement Four [Member] |  |
Derivative [Line Items] |  |
Trade Date | Oct. 29, 2020 |
Effective Date | Mar. 31, 2022 |
Maturity | Feb. 28, 2025 |
Fixed Rate | 0.623% |
Notional Amount at Effective Date | $ 100.0 |
Fair Value Asset (Liability) | $ (0.9) |

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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