Leases (Tables)

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

Schedule of Lease, Cost

The components of lease expense were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
($ in millions)	2021		2020		2021		2020
Operating lease cost	$	3.1	$	3.1	$	6.2	$	6.2
Short-term lease cost	0.3		0.1		0.5		0.3
Variable lease cost	1.4		0.8		2.2		1.6
Total lease cost	$	4.8	$	4.0	$	8.9	$	8.1

Supplemental cash flow information related to leases were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
($ in millions)	2021		2020		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3.1	$	3.2	$	6.3	$	6.4
Right-of-use assets obtained in exchange for new operating lease liabilities	$	0.3	$	1.8	$	0.8	$	4.3

Schedule of Lessee, Operating Lease, Liability, Maturity

Maturities of operating lease liabilities were as follows:

($ in millions)	June 30,		December 31,
Year	2021		2020
2021 (remaining period as of )	$	6.0	$	12.4
2022	10.5		10.4
2023	9.4		9.3
2024	8.7		8.7
2025	6.9		6.9
Thereafter	37.1		37.5
	78.6		85.2
Less: imputed lease interest	(13.3)		(14.7)
Total lease liabilities	$	65.3	$	70.5