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1. Basis of Presentation and Use of Estimates Basis of Presentation and Use of Estimates (Tables)
3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]
The following table presents our revenues disaggregated by geographic region based primarily on the location of the use of the product or service (in millions):
Three Months Ended
March 31,
20212020
Europe$247.7 $195.7 
Asia168.9 111.4 
United States271.4 229.5 
Other (primarily Canada and Latin America)38.8 35.0 
Total net sales$726.8 $571.6 
Schedule of Product Warranty Liability [Table Text Block]
Warranty liabilities are included in Other current liabilities and Other long-term liabilities in the condensed consolidated balance sheets. Change in our warranty liability for the three month period ended March 31, 2021 and 2020 were as follows (in millions):
Three Months Ended
March 31,
20212020
Balance at beginning of period$9.8 $9.0 
Provision for warranty2.7 1.9 
Actual warranty costs(2.6)(2.7)
Balance at end of period$9.9 $8.2 
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
Changes in our allowance for doubtful accounts were as follows (in millions):
Three Months Ended
March 31,
20212020
Balance at beginning of period$19.8 $20.2 
Provision (recovery) for expected credit losses(0.6)(0.8)
Write-offs charged against the allowance(0.6)(0.5)
Balance at end of period$18.6 $18.9