Commitments and Contingencies - Tariff Matter (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares
Loss Contingency Accrual, Disclosures [Abstract]
Earnings Per Share, Basic, Increase (Decrease) During Period, Change in Estimate, Tariffs | $ / shares	$ (0.07)	$ (0.07)
Earnings Per Share, Diluted, Increase (Decrease) During Period, Change in Estimate, Tariffs | $ / shares	$ (0.07)	$ (0.07)
Tariffs
Loss Contingency Accrual, Disclosures [Abstract]
Loss contingency accrual	$ 6.1	$ 6.1
Tariffs, Period Prior to Acquisition
Loss Contingency Accrual, Disclosures [Abstract]
Loss contingency accrual	2.8	2.8
Tariffs, Period after Acquisition
Loss Contingency Accrual, Disclosures [Abstract]
Loss contingency accrual	$ 3.3	$ 3.3