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Leases (Tables)
6 Months Ended
Jun. 30, 2019
Leases [Abstract]  
Lessee, Operating Lease, Liability, Maturity
The undiscounted maturities of our operating lease liability balances are as follows (in millions):

Year
As of June 30, 2019

2019
$
1.4

2020
0.4

2021
0.3

2022
0.1

2023
0.2

Thereafter
39.9

Total
42.3

Less: Interest
(17.0
)
ROUL
$
25.3