Foreign Operations (Tables)

12 Months Ended

Dec. 31, 2017

Concentration Risks, Types, No Concentration Percentage [Abstract]

Foreign operations data

The following table shows our domestic and foreign revenues and identifiable assets for the years ended or as of December 31 (in millions):

	2017		2016		2015
Revenues
Foreign	$	324.0	$	320.7	$	329.4
United States	1,052.9		1,097.6		1,120.5
Total	$	1,376.9	$	1,418.3	$	1,449.9
Identifiable Assets
Foreign	$	2,407.2	$	2,098.2	$	1,992.3
United States	5,015.2		5,007.2		4,901.9
Total	$	7,422.4	$	7,105.4	$	6,894.2