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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Lease Commitments
Our total minimum future lease commitments under operating leases as of December 31, 2017 are as follows:
(In millions)
 
 
Year
 
Minimum Future
Lease Commitments
2018
 
$
1.9

2019
 
1.6

2020
 
1.5

2021
 
1.1

2022
 
0.5

Total
 
$
6.6