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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 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 September 30, 2018 were as follows (in millions):
Fiscal Year Ending
 
Remainder of 2018
$
2.6

2019
13.8

2020
14.7

2021
15.1

2022
4.2

Thereafter
9.4

Total
$
59.8