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Summary of Significant Accounting Policies New Accounting Pronouncements or Change in Accounting Principle (Tables) | 6 Months Ended
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Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
(in millions) | As reported Sep 30, 2018 |  | Revenue Recognition Adoption Impact |  | Adjusted Oct 1, 2018
Deferred income taxes, net | $ | 134.7 |  |  | $ | (11.0 | ) |  | $ | 123.7 |
Current liabilities: |  |  |  |  |
Stored value card liability and current portion of deferred revenue | 1,642.9 |  |  | (422.0 | ) |  | 1,220.9 |
Deferred revenue | 6,775.7 |  |  | 64.0 |  |  | 6,839.7 |
Other long-term liabilities | 1,430.5 |  |  | 79.0 |  |  | 1,509.5 |
Shareholders' equity: |  |  |  |  |
Retained earnings | 1,457.4 |  |  | 268.0 |  |  | 1,725.4 |

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