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Shareholders' Equity - Summary of Activity of Common Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Feb. 24, 2020 | Nov. 18, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Feb. 24, 2020
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 6.2 | 4.9 |
Average price per share (in dollars per share) |  |  | $ 58.57 | $ 54.34 |
Total repurchase amount |  |  |  | $ 268.5 |
Treasury Stock |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Total repurchase amount |  |  | $ 364.6 | $ 268.5 |
Open Market Purchases |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 4.1 | 4.6 |
Average price per share (in dollars per share) |  |  | $ 56.97 | $ 54.22 |
Total repurchase amount |  |  |  | $ 250.0 |
Open Market Purchases | Treasury Stock |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Total repurchase amount |  |  | $ 230.6 |  |
Private Purchases |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 0.1 | 0.3 |
Average price per share (in dollars per share) |  |  | $ 62.30 | $ 56.02 |
Total repurchase amount |  |  |  | $ 18.5 |
Private Purchases | Treasury Stock |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Total repurchase amount |  |  | $ 9.2 |  |
ASR |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) | 0.3 | 1.7 | 2.0 |  | 2.0
Average price per share (in dollars per share) |  |  | $ 61.47 |  | $ 61.59
Total repurchase amount | $ 18.5 | $ 106.3 | $ 125.0 |  |
ASR | Treasury Stock |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Total repurchase amount |  |  | $ 124.8 |  |

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