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Commitments and Contingencies - Unconditional purchase commitments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Maturity of unconditional purchase commitments that are fixed and determinable  
2020 $ 226.2
2021 19.7
2022 3.8
2023 0.3
2024 0.2
Total $ 250.2