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Operating Segments and Related Disclosures (Tables)
12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Operating Revenues by Geographic Region Operating revenues by geographic region as defined by the Department of Transportation ("DOT") area are summarized below:
202120202019
(in millions)
DOT—Domestic$2,824.8 $1,660.7 $3,462.8 
DOT—Latin America and Caribbean406.0 149.3 367.7 
Total$3,230.8 $1,810.0 $3,830.5