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Shareholder's Equity - Summary of Activity of Common Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 24, 2020 | Nov. 18, 2019 | Jan. 03, 2021 | Dec. 29, 2019 | Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of Shares Repurchased (in shares) |  |  | 0.6 | 3.2 |
Average Price Per Share (in dollars per share) |  |  | $ 65.27 | $ 61.92 |
Amount |  |  | $ 42.3 |  |
Treasury Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Amount |  |  | $ 42.3 | $ 196.9 |
Open Market Purchases |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of Shares Repurchased (in shares) |  |  | 0.0 | 1.3 |
Average Price Per Share (in dollars per share) |  |  | $ 0 | $ 62.06 |
Open Market Purchases | Treasury Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Amount |  |  | $ 0.0 | $ 81.4 |
Private Purchases |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of Shares Repurchased (in shares) |  |  | 0.6 | 0.2 |
Average Price Per Share (in dollars per share) |  |  | $ 65.27 | $ 62.30 |
Private Purchases | Treasury Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Amount |  |  | $ 42.3 | $ 9.2 |
ASR |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of Shares Repurchased (in shares) | 0.3 | 1.7 | 0.0 | 1.7 | 2.0
Average Price Per Share (in dollars per share) |  |  | $ 0 | $ 61.79 | $ 61.59
Amount | $ 18.5 | $ 106.3 |  | $ 125.0 |
ASR | Treasury Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Amount |  |  | $ 0.0 | $ 106.3 |

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