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Geographic Data
 6 Months Ended
Jun. 30, 2022
Segment Reporting [Abstract]  
Geographic Data Geographic Data
The following table summarizes certain geographic information (in millions):
June 30,December 31,June 30,
 202220212021
Long-lived assets:  
U.S.$653.8 $666.5 $652.9 
Canada10.3 9.9 10.4 
Total long-lived assets$664.1 $676.4 $663.3