Leases (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Components of Lease Costs

The components of lease costs were as follows (in millions):

	Year Ended December 31,				(transition period) Three Months Ended December 31,		Year Ended September 30,
	2023		2022		2021		2021
Operating lease cost	$	58.6	$	54.0	$	13.9	$	53.3
Finance lease cost - amortization		13.8		9.9		2.1		5.4
Finance lease cost - interest		1.4		0.6		0.1		0.4
Variable lease cost		31.7		31.9		7.1		34.0
Short-term lease cost		11.1		11.1		2.5		9.5

Summary of Supplemental Information Related to Leases

Supplemental information related to leases was as follows (in millions):

		December 31, 2023
	Balance Sheet Classification	Operating leases			Finance leases			Total
Lease right of use assets	Other long-term assets	$	205.9		$	58.4		$	264.3
Current lease liabilities	Other current liabilities		38.6			15.4			54.0
Long-term lease liabilities	Other long-term liabilities		178.1			43.9			222.0
Weighted average remaining lease term		7.2 years			5.7 years
Weighted average discount rates			3.8	%		3.9	%

		December 31, 2022
	Balance Sheet Classification	Operating leases			Finance leases			Total
Lease right of use assets	Other long-term assets	$	209.2		$	28.0		$	237.2
Current lease liabilities	Other current liabilities		44.6			9.9			54.5
Long-term lease liabilities	Other long-term liabilities		174.7			18.7			193.4
Weighted average remaining lease term		7.9 years			4.0 years
Weighted average discount rates			3.4	%		2.5	%

Summary Right of Use Assets Balance for Leases by Segment

The table below presents the right of use asset balance for leases disaggregated by segment and type of lease (in millions):

	December 31, 2023
	Access		Defense		Vocational		Corporate and intersegment eliminations		Total
Operating Leases
Real estate leases	$	83.9	$	39.3	$	58.5	$	9.8	$	191.5
Equipment leases		6.4		1.0		2.1		4.9		14.4
	$	90.3	$	40.3	$	60.6	$	14.7	$	205.9
Finance Leases
Real estate leases	$	8.9	$	2.4	$	0.6	$	—	$	11.9
Equipment leases		4.9		5.6		2.3		33.7		46.5
	$	13.8	$	8.0	$	2.9	$	33.7	$	58.4

	December 31, 2022
	Access		Defense		Vocational		Corporate and intersegment eliminations		Total
Operating Leases
Real estate leases	$	77.2	$	45.7	$	62.9	$	9.6	$	195.4
Equipment leases		3.6		1.1		2.6		6.5		13.8
	$	80.8	$	46.8	$	65.5	$	16.1	$	209.2
Finance Leases
Real estate leases	$	4.1	$	2.8	$	—	$	—	$	6.9
Equipment leases		3.2		3.0		1.4		13.5		21.1
	$	7.3	$	5.8	$	1.4	$	13.5	$	28.0

Schedule of Maturities and Minimum Payments of Lease Liabilities

Maturities of lease liabilities at December 31, 2023 and minimum payments for leases having initial or remaining non-cancelable terms in excess of one year were as follows (in millions):

Amounts due in	Operating leases			Finance leases			Total
2024	$	48.7		$	17.4		$	66.1
2025		38.7			14.1			52.8
2026		32.0			10.7			42.7
2027		28.5			7.5			36.0
2028		25.3			3.8			29.1
Thereafter		75.8			13.2			89.0
Total lease payments		249.0			66.7			315.7
Less: imputed interest		(32.3	)		(7.4	)		(39.7	)
Present value of lease liability	$	216.7		$	59.3		$	276.0