Leases (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Lease, Cost

The components of lease expense were as follows:

($ in millions)	2021		2020		2019
Operating lease cost	$	12.7	$	12.8	$	12.9
Short-term lease cost	1.3		0.8		0.8
Variable lease cost	4.8		3.8		3.3
Total lease cost	$	18.8	$	17.4	$	17.0

Cash Flow and Supplemental information

Supplemental information related to leases was as follows:

($ in millions)	2021		2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	12.1	$	12.6	$	12.5
Right-of-use assets obtained in exchange for new operating lease liabilities	13.3		6.1		9.1

Lessee, Operating Lease, Liability, Maturity

Maturities of lease liabilities as of December 31, 2021 were as follows:

($ in millions)	Operating
Year	Leases
2022	$	11.5
2023	10.7
2024	10.0
2025	8.2
2026	7.3
Thereafter	38.7
	86.4
Less: imputed lease interest	(14.1)
Total lease liabilities	$	72.3