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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020 | Sep. 28, 2020
Line of Credit Facility [Line Items] |  |  |  |  |
Interest expense | $ 13.0 | $ 15.7 | $ 38.9 | $ 47.1 |
Senior Notes | 2028 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 4.625% |  | 4.625% |  |
Interest expense | $ 4.8 | 4.8 | $ 14.4 | 14.4 |
Senior Notes | 2025 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 4.375% |  | 4.375% |  |
Interest expense | $ 0.0 | 10.9 | $ 0.0 | 32.7 |
Senior Notes | 2029 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 3.25% |  | 3.25% |  | 3.25%
Interest expense | $ 8.2 | $ 0.0 | $ 24.5 | $ 0.0 |

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