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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |
Non-cash interest expense | $ 8.6 | $ 15.0 | $ 49.4
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 62.7 | 69.2 | 57.3
Non-cash interest expense | 2.8 | 3.6 | 3.9
Senior Notes | 2028 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 19.2 | 13.3 | 0.0
Non-cash interest expense | $ 0.7 | 0.5 | 0.0
Interest rate (percent) | 4.625% |  |
Senior Notes | 2025 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 43.5 | 34.7 | 0.0
Non-cash interest expense | $ 2.1 | 1.6 | 0.0
Interest rate (percent) | 4.375% |  |
Senior Notes | 2022 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 0.0 | 21.2 | 57.3
Non-cash interest expense | $ 0.0 | $ 1.5 | $ 3.9
Interest rate (percent) |  | 5.25% |

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