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Foreign Operations (Tables)
 12 Months Ended
Dec. 31, 2019
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):
 
2019
 
2018
 
2017
Revenues
 
 
 
 
 
Foreign
$
331.1

 
$
333.5

 
$
324.0

United States
1,062.7

 
1,027.4

 
1,052.9

Total
$
1,393.8

 
$
1,360.9

 
$
1,376.9

 
 
 
 
 
 
Identifiable Assets
 
 
 
 
 
Foreign
$
2,624.5

 
$
2,470.9

 
$
2,407.2

United States
5,660.6

 
5,145.8

 
5,015.2

Total
$
8,285.1

 
$
7,616.7

 
$
7,422.4