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Operating Segments and Related Disclosures (Tables)
 12 Months Ended
Dec. 31, 2019
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:
 
2019
 
2018
 
2017
 
(in millions)
DOT—Domestic
$
3,462.8

 
$
2,990.7

 
$
2,432.1

DOT—Latin America and Caribbean
367.7

 
332.3

 
211.5

Total
$
3,830.5

 
$
3,323.0

 
$
2,643.6