Leases Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense were as follows:

($ in millions)	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease cost	$	3.1	$	6.3
Short-term lease cost	0.2		0.4
Variable lease cost	0.9		1.5
Total lease cost	$	4.2	$	8.2

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

Supplemental information related to leases was as follows:

($ in millions)	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3.1	$	6.2
Right-of-use assets obtained in exchange for new operating lease liabilities	$	1.3	$	8.1

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

Maturities of lease liabilities as of June 30, 2019 were as follows:

($ in millions)	Operating
Year	Leases
2019 (remaining six months)	$	6.6
2020	12.0
2021	10.2
2022	8.4
2023	7.8
Thereafter	48.9
	93.9
Less: imputed lease interest	(17.3		)
Total lease liabilities	$	76.6

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

of December 31, 2018 were as follows:

($ in millions)	Operating
Year	Leases
2019	$	13.0
2020	10.5
2021	7.8
2022	6.9
2023	5.5
Thereafter	37.8
Total	$	81.5