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Long‑Term Debt - Bank Credit Facility Narrative (Details) | Jan. 25, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 19, 2017 USD ($)
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Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | $ 1,269,842,000 | $ 246,000,000 |
Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Remaining borrowing capacity |  | 813,463,000 | $ 253,850,000 |
Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accordion feature, increase limit |  |  |  | $ 200,000,000
Revolving Credit Facility | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings guaranteed through stock of foreign subsidiaries (as a percent) |  |  |  | 0.65
Revolving Credit Facility | Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  |  | $ 500,000,000
Revolving Credit Facility | New Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 850,000,000 |  |  |
Write off of unamortized debt issuance costs | 353,000 |  |  |
Capitalization of professional fees | 3,577,000 |  |  |
Debt covenant, cross-defaults of other debt threshold | 50,000,000 |  |  |
Debt covenant, judgment defaults threshold | $ 10,000,000 |  |  |
Letter of Credit | Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  |  | 50,000,000
Bridge Loan | Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  |  | $ 85,000,000
Letters of Credit And Surety Bonds | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | $ 150,000 |  |
Revolving Credit Facility - Euro Currency | Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.25% |  |  |
Revolving Credit Facility - Euro Currency | Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.25% |  |  |
Revolving Credit Facility - Non-Euro Currency | Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.00% |  |  |
Revolving Credit Facility - Non-Euro Currency | Credit Facility | Overnight Bank Funding Effective Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.50% |  |  |
Revolving Credit Facility - Non-Euro Currency | Credit Facility | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unused capacity, commitment fee percentage | 0.20% |  |  |
Revolving Credit Facility - Non-Euro Currency | Credit Facility | Minimum | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.25% |  |  |
Revolving Credit Facility - Non-Euro Currency | Credit Facility | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unused capacity, commitment fee percentage | 0.30% |  |  |
Revolving Credit Facility - Non-Euro Currency | Credit Facility | Maximum | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.25% |  |  |

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