Leases (Tables)

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense were as follows:

	Three Months Ended March 31,
($ in millions)	2020		2019
Operating lease cost	$	3.1	$	3.2
Short-term lease cost	0.2		0.2
Variable lease cost	0.8		0.6
Total lease cost	$	4.1	$	4.0

Lessee, Lease Cash Flow and Supplemental Information [Table Text Block]

Supplemental cash flow information related to leases were as follows:

	Three Months Ended March 31,
($ in millions)	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3.2	$	3.1
Right-of-use assets obtained in exchange for new operating lease liabilities	$	2.5	$	6.8

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of operating lease liabilities were as follows:

($ in millions)	March 31,		December 31,
Year	2020		2019
2020	$	9.0	$	12.1
2021	10.9		10.4
2022	9.2		8.6
2023	8.2		7.8
2024	7.7		7.3
Thereafter	41.0		41.8
	86.0		88.0
Less: imputed lease interest	(15.4)		(16.0)
Total lease liabilities	$	70.6	$	72.0