Leases (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Schedule of Lease, Cost

The components of lease expense were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
($ in millions)	2021		2020		2021		2020
Operating lease cost	$	3.3	$	3.1	$	9.5	$	9.3
Short-term lease cost	0.4		0.3		0.9		0.6
Variable lease cost	1.1		1.2		3.3		2.8
Total lease cost	$	4.8	$	4.6	$	13.7	$	12.7

Supplemental cash flow information related to leases were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
($ in millions)	2021		2020		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2.9	$	3.2	$	9.2	$	9.6
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	0.3	$	0.8	$	4.6

Schedule of Lessee, Operating Lease, Liability, Maturity

Maturities of operating lease liabilities were as follows:

($ in millions)	September 30,		December 31,
Year	2021		2020
2021 (remaining period as of )	$	3.0	$	12.4
2022	10.3		10.4
2023	9.3		9.3
2024	8.5		8.7
2025	6.8		6.9
Thereafter	36.2		37.5
	74.1		85.2
Less: imputed lease interest	(12.6)		(14.7)
Total lease liabilities	$	61.5	$	70.5