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Commitments and Contingencies - Purchase Obligations (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 (remaining) $ 193.3
2020 92.2
2021 57.2
2022 8.6
2023 3.1
Thereafter 7.0
Total purchase commitments $ 361.4