Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Earnings Including Redeemable Noncontrolling Interest	$ 39.3	$ 32.9
Hedging adjustments:
Reclassifications to net earnings	(0.5)	(0.5)
Foreign currency translation adjustments:
Unrealized foreign currency translation adjustments	(0.4)	0.9
Total Other Comprehensive Income Including Redeemable Noncontrolling Interest	0.1	1.4
Less: Comprehensive income attributable to redeemable noncontrolling interest	31.2	26.1
Total Comprehensive Income Available to Class A Common Stockholders	$ 8.2	$ 8.2