Operating Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Components of Lease Expense and Supplemental Cash Flow Information Related to Leases

The components of lease expense for the three and nine months ended September 30, 2019 were as follows:

$ in millions	Three months ended September 30, 2019		Nine months ended September 30, 2019
Operating lease cost	19.9		49.7
Variable lease cost	6.8		19.5
Less: sublease income	(0.2	)	(0.4	)
Total lease expense	26.5		68.8

Supplemental cash flow information related to leases for the three and nine months ended September 30, 2019 was as follows:

$ in millions	Three months ended September 30, 2019	Nine months ended September 30, 2019
Operating cash flows from operating leases included in the measurement of lease liabilities	20.9	54.1
Right-of-use assets obtained in exchange for new operating lease liabilities	13.5	161.9

Maturities of Company's Lease Liabilities

As of September 30, 2019 the maturities of the company’s lease liabilities (primarily related to real estate leases) were as follows:

$ in millions
Year Ending December 31,	Lease Liabilities
2019 (excluding the nine months ended September 30, 2019)	19.8
2020	74.5
2021	69.0
2022	61.6
2023	54.3
Thereafter	138.4
Total lease payments	417.6
Less: interest	(46.2	)
Present value of lease liabilities	371.4

Schedule of Future Commitments Under Non-cancelable Operating Leases

As of December 31, 2018, the company’s total future commitments by year under non-cancelable operating leases were as follows:

$ in millions	Total
2019	61.6
2020	56.3
2021	49.3
2022	42.8
2023	36.7
Thereafter	53.5
Gross lease commitments	300.2
Less: future minimum payments expected to be received under non-cancelable subleases	(2.5	)
Net lease commitments	297.7