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Foreign Operations (Tables)
 12 Months Ended
Dec. 31, 2015
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):
 
2015
 
2014
 
2013
Revenues
 
 
 
 
 
Foreign
$
329.4

 
$
346.2

 
$
332.1

United States
1,120.5

 
1,104.8

 
988.9

 
$
1,449.9

 
$
1,451.0

 
$
1,321.0

Identifiable Assets
 
 
 
 
 
Foreign
$
1,992.3

 
$
2,133.3

 
$
2,199.2

United States
4,901.9

 
4,786.6

 
4,336.3

 
$
6,894.2

 
$
6,919.9

 
$
6,535.5