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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):
202420232022
Revenues
Foreign
$637.3 $548.1 $466.9 
United States
948.2 862.8 806.1 
Total
$1,585.5 $1,410.9 $1,273.0 
Identifiable Assets
Foreign
$5,167.2 $4,718.5 $3,910.2 
United States
7,129.3 6,607.5 6,161.8 
Total
$12,296.5 $11,326.0 $10,072.0