Leases Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense were as follows:

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

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

Supplemental information related to leases was as follows:

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

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

Maturities of lease liabilities as of March 31, 2019 were as follows:

($ in millions)	Operating
Year	Leases
2019 (remaining nine months)	$	9.6
2020	11.5
2021	9.8
2022	8.1
2023	7.6
Thereafter	49.0
	95.6
Less: imputed lease interest	(18.0		)
Total lease liabilities	$	77.6

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