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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Purchase Obligations
Purchase obligations as of March 31, 2019 are as follows (in millions):
2019 (remaining)
$
193.3

2020
92.2

2021
57.2

2022
8.6

2023
3.1

Thereafter
7.0

Total purchase commitments
$
361.4