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Debt (Narrative) (Detail) € in Millions, £ in Millions, $ in Millions | May 04, 2020 USD ($) | Apr. 03, 2020 GBP (£) loan | Apr. 03, 2020 USD ($) loan | Apr. 03, 2020 EUR (€) loan | Feb. 24, 2020 GBP (£) | Jan. 03, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt |  |  | $ 1,975.4 |  |  | $ 1,843.2
Uncommitted Revolving Credit Facilities $75 million |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 75.0 |  |  |
Number Of Revolving Loan Facilities | loan |  | 2 | 2 | 2 |  |
Uncommitted Revolving Credit Facilities 100 million euros |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | € |  |  |  | € 100.0 |  |
Number Of Revolving Loan Facilities | loan |  | 1 | 1 | 1 |  |
Uncommitted Revolving Credit Facilities 55 million GBP |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | £ |  | £ 55.0 |  |  | £ 55.0 |
Number Of Revolving Loan Facilities | loan |  | 1 | 1 | 1 |  |
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 1,750.0 |  |  |
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility, due May 2023 [Member] | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 1,250.0 |  |  |
JPMorgan Chase Bank, N.A. [Member] | Delayed Draw Term Loan [Member] | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 500.0 |  |  |
JPMorgan Chase Bank, N.A. [Member] | Additional Loan Facility [Member] | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 500.0 |  |  |
Subsequent Event [Member] | JPMorgan Chase Bank, N.A. [Member] | Term Loan, due July 2022 | Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 225.0 |  |  |  |  |

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