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Debt (Narrative) (Details) £ in Millions | Jan. 01, 2021 USD ($) loan | Jan. 01, 2021 GBP (£) loan | Feb. 24, 2020 GBP (£) | Jan. 03, 2020 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt outstanding | $ 1,291,400,000 |  |  | $ 1,624,200,000
Uncommitted Revolving Credit Facilities 55 million pounds GBP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity | £ |  | £ 55.0 | £ 55.0 |
Number of revolving loan facilities | loan | 1 | 1 |  |
Uncommitted Revolving Credit Facilities $75 million |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity | $ 75,000,000.0 |  |  |
Number of revolving loan facilities | loan | 2 | 2 |  |
Uncommitted Revolving Credit Facilities 100 million euros |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity | £ |  | £ 100.0 |  |
Number of revolving loan facilities | loan | 1 | 1 |  |
Promissory Notes and Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Promissory notes and other debt | $ 100,000 |  |  | $ 300,000
Two Thousand Eighteen Credit Facility | JPMorgan Chase Bank | Unsecured Debt | Revolving Credit Facility, due May 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity | 1,250,000,000 |  |  |
Two Thousand Eighteen Credit Facility | JPMorgan Chase Bank | Unsecured Debt | Additional Loan Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity | 500,000,000.0 |  |  |
Debt outstanding | $ 0 |  |  |

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