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Leases (Tables)
12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Schedule of maturities of operating lease liability balances
The undiscounted maturities of our operating lease liability balances are as follows (in millions):

Year
As of December 31, 2019
2020
$
4.5

2021
3.3

2022
2.6

2023
2.4

2024
2.4

Thereafter
27.5

Total
42.7

Less: Interest
(17.1
)
ROUL
$
25.6