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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2020 $ 83.6
2021 1.0
2022 0.3
2023 0.0
2024 0.0
Thereafter 0.0
Total unconditional purchase commitments $ 84.9