Redeemable Noncontrolling Interest (Tables)

12 Months Ended

Sep. 30, 2021

Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]

Redeemable noncontrolling interest

	As Of and For The  Year Ended September 30,
	2021		2020
Beginning of period	$	2,021.6	$	—
Net earnings attributable to NCI after IPO	86.8		71.1
Net change in hedges, net of tax	1.6		(6.7)
Foreign currency translation adjustments	(0.2)		0.7
Impact of IPO	—		1,364.6
Redemption value adjustment to NCI	887.5		591.9
End of period	$	2,997.3	$	2,021.6

Parent ownership interest, effects of changes, net

	As Of and For The  Year Ended September 30,
	2021		2020
Net earnings available to Class A Common Stockholders	$	27.6	$	23.5
Transfers to NCI:
Impact of IPO	—		1,364.6
Redemption value adjustment to NCI	887.5		591.9
Changes from net earnings available to Class A Common Stockholders and transfers to NCI	$	915.1	$	1,980.0