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Fair Value Of Assets And Liabilities (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 27, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted cash | $ 49,800,000 | $ 46,300,000 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted cash | 49,800,000 | 46,300,000 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted cash | 0 | 0 |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted cash | $ 0 | 0 |
2027 Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Stated interest rate | 5.50% |  |
2027 Senior Notes | Senior Notes | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | $ 0 | 0 |
2027 Senior Notes | Senior Notes | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 584,800,000 | 636,000,000.0 |
2027 Senior Notes | Senior Notes | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | $ 0 | 0 |
2028 Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Stated interest rate | 4.75% |  |
2028 Senior Notes | Senior Notes | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | $ 0 | 0 |
2028 Senior Notes | Senior Notes | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 480,300,000 | 515,200,000 |
2028 Senior Notes | Senior Notes | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 0 | 0 |
Term Loan B | Term Loan B due 2024 | Line of Credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Face amount of debt issuance |  |  | $ 400,000,000.0
Term Loan B | Term Loan B due 2024 | Line of Credit | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 0 | 0 |
Term Loan B | Term Loan B due 2024 | Line of Credit | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 390,000,000.0 | 392,000,000.0 |
Term Loan B | Term Loan B due 2024 | Line of Credit | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 0 | 0 |
Revolving Credit Facility | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 0 |  |
Revolving Credit Facility | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 694,600,000 |  |
Revolving Credit Facility | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 0 |  |
Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted cash | 49,800,000 | 46,300,000 |
Carrying Amount | 2027 Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 592,600,000 | 592,000,000.0 |
Carrying Amount | 2028 Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 494,200,000 | 493,900,000 |
Carrying Amount | Term Loan B | Term Loan B due 2024 | Line of Credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 386,500,000 | 388,000,000.0 |
Carrying Amount | Revolving Credit Facility |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 694,600,000 |  |
Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Restricted cash | 49,800,000 | 46,300,000 |
Fair Value | 2027 Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 584,800,000 | 636,000,000.0 |
Fair Value | 2028 Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 480,300,000 | 515,200,000 |
Fair Value | Term Loan B | Term Loan B due 2024 | Line of Credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | 390,000,000.0 | $ 392,000,000.0 |
Fair Value | Revolving Credit Facility |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure of debt | $ 694,600,000 |  |

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