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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Carrying Value [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Debt | $ 2,608.3 | $ 2,572.2
Carrying Value [Member] | Revolving Credit Facility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Debt | 820.0 | 785.0
Carrying Value [Member] | Senior Notes [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Debt | 1,788.3 | 1,787.2
Fair Value [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Debt | 2,765.0 | 2,779.9
Fair Value [Member] | Revolving Credit Facility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Debt | 820.0 | 785.0
Fair Value [Member] | Senior Notes [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Debt | $ 1,945.0 | $ 1,994.9

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + 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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