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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Estimated Future Cash Outlays Related to Principal Contractual Obligations The estimated future cash outlays are as follows:
Year
Amount
(in millions)
2021$52.3 
202224.8 
202319.8 
202417.6 
202513.7 
Total$128.2