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Fair Value Measurements - Carrying Value and Fair Value of Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Carrying Value [Member] | Senior Notes [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Debt | $ 1,787.2 | $ 2,184.3
Carrying Value [Member] | Revolving Credit Facility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Debt | 785.0 |
Fair Value [Member] | Senior Notes [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Debt | 1,994.9 | $ 2,271.4
Fair Value [Member] | Revolving Credit Facility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Debt | $ 785.0 |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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