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Long-Term Debt - Schedule of Group's debt comprised (Detail) € in Millions, £ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2024 EUR (€) | Mar. 31, 2024 GBP (£) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 6,888 |  |  | $ 7,110 |  |
Less: unamortized debt issuance costs | (52) |  |  | (54) |  |
Total debt | 6,836 |  |  | 7,056 |  |
Current portion | (46) |  |  | (51) |  |
Total long-term debt | 6,790 |  |  | 7,005 |  |
USD First Lien Term Loan B Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 0 |  |  | 514 |  |
Debt Instrument, Maturity Date, Description | 2028 |  |  |  |  |
USD First Lien Term Loan B Due 2028 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 0 |  |  | 514 |  |
EUR First Lien Term Loan B Due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 548 |  |  | 560 |  |
Debt Instrument, Maturity Date, Description | 2026 |  |  |  |  |
EUR First Lien Term Loan B Due 2026 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | € |  | € 507 |  |  | € 507 |
GBP First Lien Term Loan A Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 1,307 |  |  | 1,315 |  |
Debt Instrument, Maturity Date, Description | 2028 |  |  |  |  |
GBP First Lien Term Loan A Due 2028 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | £ |  |  | £ 1,034 |  |  | £ 1,034
EUR First Lien Term Loan A Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 411 |  |  | 419 |  |
Debt Instrument, Maturity Date, Description | 2028 |  |  |  |  |
EUR First Lien Term Loan A Due 2028 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | € |  | € 380 |  |  | € 380 |
USD First Lien Term Loan A Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 166 |  |  | 166 |  |
Debt Instrument, Maturity Date, Description | 2028 |  |  |  |  |
USD First Lien Term Loan A Due 2028 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 166 |  |  | 166 |  |
USD First Lien Term Loan B Due 2030 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 3,908 |  |  | 3,400 |  |
Debt Instrument, Maturity Date, Description | 2030 |  |  |  |  |
USD First Lien Term Loan B Due 2030 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 3,905 |  |  | 3,400 |  |
GBP Revolving Credit Facility Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | $ 548 |  |  | $ 736 |  |
Debt Instrument, Maturity Date, Description | 2028 |  |  |  |  |
GBP Revolving Credit Facility Due 2028 [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Gross | £ |  |  | £ 433 |  |  | £ 578

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