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Other Intangible Assets and Goodwill (Estimated Future Amortization Expense) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Fiscal Year Ending |
2019 (excluding the two quarters ended March 31, 2019) | $ | 111.2 |
2020 | 222.2 |
2021 | 198.7 |
2022 | 170.1 |
2023 | 3.5 |
Thereafter | 7.6 |
Total estimated future amortization expense | $ | 713.3 |
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year | $ 111.2 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 222.2 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 198.7 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 170.1 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 3.5 |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 7.6 |
Finite-Lived Intangible Assets, Net | $ 713.3 | $ 811.2

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