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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Components of lease expense and Supplemental Cash Flow Information
The components of lease expense for the year ended December 31, 2019 were as follows:
$ in millions
Year ended December 31, 2019
Operating lease cost
70.0

Variable lease cost
26.8

Less: sublease income
(0.6
)
Total lease expense
96.2

Supplemental cash flow information related to leases for the year ended December 31, 2019 was as follows:
$ in millions
Year ended December 31, 2019
Operating cash flows from operating leases included in the measurement of lease liabilities
72.8

Right-of-use assets obtained in exchange for new operating lease liabilities
167.7


Maturities of Company's lease liabilities
As of December 31, 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
2020
77.6

2021
71.9

2022
63.3

2023
54.9

2024
40.7

Thereafter
99.3

Total lease payments
407.7

Less: interest
(42.9
)
Present value of lease liabilities
364.8


Company's total future commitments under non-cancelable operating leases
$ in millions
Total
 
Buildings
 
Other
2019
61.6

 
59.4

 
2.2

2020
56.3

 
54.2

 
2.1

2021
49.3

 
48.3

 
1.0

2022
42.8

 
42.6

 
0.2

2023
36.7

 
36.7

 

Thereafter
53.5

 
53.5

 

Gross lease commitments
300.2

 
294.7

 
5.5

Less: future minimum payments expected to be received under non-cancelable subleases
(2.5
)
 
(2.5
)
 

Net lease commitments
297.7

 
292.2

 
5.5