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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2021 $ 91.8
2022 1.4
2023 0.6
2024 0.1
2025 0.1
Thereafter 0.0
Total unconditional purchase commitments $ 94.0