Leases (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Schedule of Operating Lease Costs, Variable Lease Costs and Supplemental Cash Flow Information

The following table presents operating lease costs, variable lease costs and supplemental cash flow information:

	Year Ended December 31,
	2023		2022		2021
(Dollars in millions)
Operating lease costs	$	28.7	$	29.3	$	30.2
Variable lease costs		4.0		3.3		3.3
Cash paid for amounts included in the measurement    of lease liabilities:
Operating cash outflow from operating leases	$	39.5	$	29.3	$	30.5

Summary of Amount and Timing of Cash Flows From Operating Leases

The following table presents information about the amount and timing of cash flows arising from our operating leases as of December 31, 2023:

(Dollars in millions)
2024	$	28.2
2025		22.8
2026		17.7
2027		14.7
2028		11.7
Thereafter		12.5
Total lease payments	$	107.6
Less: Interest		(17.3	)
Present value of lease liabilities	$	90.3

Schedule of Supplemental Consolidated Balance Sheet Information Related to Leases

Supplemental consolidated balance sheet information related to leases is as follows:

	December 31,
	2023			2022
Weighted average remaining lease term, in years		5.0			5.6
Weighted average discount rate		6.8	%		7.2	%