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Commitments and Contingencies Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2019
Commitments and Contingencies [Abstract]  
Summary of Maturities of Lease Liabilities The following is a summary of maturities of lease liabilities as of June 30, 2019:
(in millions)
 
Year ended December 31,
Operating Leases

Remainder of 2019
$
2.2

2020
3.4

2021
3.2

2022
2.9

2023
2.7

Thereafter
5.0

Less: discount for time value
(3.2
)
Lease liability as of June 30, 2019
$
16.2