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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Rental Obligations
Rental obligations, excluding real estate taxes, operating costs, and tenant improvement allowances, under all lease agreements as of June 30, 2018 were as follows (in millions):
Fiscal Year Ending
 
Remainder of 2018
$
5.1

2019
11.1

2020
11.5

2021
11.7

2022
3.7

Thereafter
9.4

Total
$
52.5