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Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Prior Period Reclassification
The following table presents Acquisition-related intangible asset amortization and Selling and administrative expenses, excluding the Acquisition-related intangible asset amortization, for the years ended September 30, 2019, 2018 and 2017, and for each quarterly period of fiscal 2019.

Quarter EndedYear Ended
December 31,
2018		March 31,
2019		June 30,
2019		September 30,
2019		September 30,
2019		September 30,
2018		September 30,
2017
Selling and administrative expense, previously reported$218.0  $231.2  $246.4  $245.4  $941.0  $891.6  $874.5  
Less, Acquisition-related intangible asset amortization25.7  27.3  29.3  40.1  122.4  106.9  108.4  
Selling and administrative expense, currently reported$192.3  $203.9  $217.1  $205.3  $818.6  $784.7  $766.1