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Acquisitions and Divestitures Definite-lived intangible assets acquired (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 1,215.8 | $ 1,182.2
Finite-Lived Intangible Assets, Accumulated Amortization | 502.5 | 371.0
Finite-Lived Intangible Assets, Net | 713.3 | 811.2
Acquired and reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 1,110.3 | 1,081.7
Finite-Lived Intangible Assets, Accumulated Amortization | 444.7 | 320.1
Finite-Lived Intangible Assets, Net | $ 665.6 | $ 761.6

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