Operating Segments and Related Disclosures (Tables)

12 Months Ended

Dec. 31, 2014

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:

	2014		2013		2012
	(in millions)
DOT—domestic	$	1,728.8	$	1,467.5	$	1,135.1
DOT—Latin America	202.8		186.9		183.3
Total	$	1,931.6	$	1,654.4	$	1,318.4