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