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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity
Future minimum operating lease payments under non-cancellable operating leases as of December 31, 2018 were as follows (in millions):
 
 
Operating Leases
2019
 
$
22.0

2020
 
18.7

2021
 
16.4

2022
 
8.8

2023
 
6.8

Thereafter
 
20.3

Total obligations
 
$
93.0