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Leases (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Minimum Future Lease Payments
Minimum future lease payments (e.g., base rent for leases of office space) due in each of the next five years and thereafter, as of December 31, 2018, are presented in the below table.
($ in millions)
 
2019
$
167.8

2020
153.1

2021
132.3

2022
99.4

2023
81.0

Thereafter
257.3

Total
$
890.9