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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future minimum rental payments for operating leases
Future minimum obligations under non-cancelable operating leases having an initial or remaining term in excess of one year as of December 31, 2018 are as follows ($ in millions):
2019
$
5.8

2020
5.0

2021
4.4

2022
3.6

2023
3.0

Thereafter
8.1

Total
$
29.9