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Foreign Operations (Tables)
 12 Months Ended
Dec. 31, 2014
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 ending or as of December 31 (in millions):
 
2014
 
2013
 
2012
Revenues
 
 
 
 
 
Foreign
$
346.2

 
$
332.1

 
$
279.8

United States
1,104.8

 
988.9

 
963.4

 
$
1,451.0

 
$
1,321.0

 
$
1,243.2

Identifiable Assets
 
 
 
 
 
Foreign
$
2,133.9

 
$
2,200.1

 
$
1,897.9

United States
4,803.6

 
4,349.5

 
4,157.5

 
$
6,937.5

 
$
6,549.6

 
$
6,055.4