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Commitment and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Long-term Purchase Commitment The minimum commitments for all of these agreements, as of December 31, 2020, are approximated as follows:
(In millions)Amount
Year ending:
2021$260.5 
2022259.3 
2023216.2 
2024140.5 
202568.3 
Thereafter108.4 
Total$1,053.2