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Debt - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 21, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Nov. 30, 2016 GBP (£) | Oct. 31, 2016 EUR (€) | Aug. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2011 CHF (SFr) | Sep. 30, 2010 GBP (£) | Dec. 31, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt outstanding in 2022 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt outstanding in 2023 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt outstanding in 2024 |  | 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt outstanding in 2025 |  | 425,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |
Maturities of long-term debt outstanding in 2026 |  | 466,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt outstanding in 2027 and thereafter |  | 1,089,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  |  |  | € 200,000,000 |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  | 6.30% |  |  | 1.53% |  |  |  |  |  |
Total borrowing capacity under revolving credit facility |  | $ 850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility expiration period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on total debt borrowings outstanding |  | 3.00% |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |
Revolving Credit Facility Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowing capacity under revolving credit facility |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity under revolving credit facility |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity under revolving credit facility |  | 1,897,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ 72,100,000 |  |  |  |  |  | $ 384,800,000 |  |  |  |  |  |  |  |  |
Percentage of weighted average interest rate on revolving credit facility |  | 1.84% |  |  |  |  |  | 1.13% |  |  |  |  |  |  |  |  |
Revolving Credit Facility Borrowings | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ 30,200,000 |  |  |  |  |  | $ 34,900,000 |  |  |  |  |  |  |  |  |
Accordion Feature |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity under revolving credit facility |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity under revolving credit facility |  | 53,000,000.0 |  |  |  |  |  | 52,200,000 |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | 0 |  |  |  |  |  | $ 9,200,000 |  |  |  |  |  |  |  |  |
Swiss franc 2.44% senior note due December 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 62,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | SFr 55,000,000 |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.44% |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 575,000,000 |  |  |  |  |  | € 75,000,000 |  |  |  |  |  |  |  |
Proceeds from funding | $ 100,000,000 |  | $ 475,000,000 | € 75,000,000 | $ 85,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 3.93% |  |  |  |  |  | 3.93% |  |  |  |  |  |  |  |
Senior Notes | 1.34% Due October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 366,800,000 |  |  |  |  |  |  |  |  | € 300,000,000 |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  | 1.34% |  |  |  |  |  |
Senior Notes | 1.53% Due October 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 244,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2.59% Due November 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 204,900,000 |  |  |  |  |  |  |  | £ 150,000,000 |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  | 2.59% |  |  |  |  |  |  |
Senior Notes | 2.70% Due November 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 102,400,000 |  |  |  |  |  |  |  | £ 75,000,000 |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  | 2.70% |  |  |  |  |  |  |
6.30% Senior Notes Due December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.30%
British pound 4.68% senior note due September 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 106,400,000 | £ 80,000,000 |  |  |  |  |  |  |  |  | £ 80,000,000 |
Interest rate on senior notes |  |  |  |  |  | 4.68% | 4.68% |  |  |  |  |  |  |  |  |  |
U.S. dollar 3.73% senior notes due September 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.73% |  |  |
U.S. dollar 3.83% senior notes due September 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.83% |  |  |
U.S. dollar 3.98% senior notes due September 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.98% |  |  |
U.S. dollar 3.91% senior notes due June 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  | 3.91% |  |  |  |
U.S. dollar 3.96% senior notes due August 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  | 3.96% |  |  |  |  |
U.S. dollar 4.45% senior notes due August 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  | 4.45% |  |  |  |  |

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