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1. Basis of Presentation and Use of Estimates Basis of Presentation and Use of Estimates (Tables)
9 Months Ended
Sep. 30, 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 (in millions):
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Europe$221.5 $220.9 $698.2 $590.6 
Asia171.2 142.0 512.2 382.3 
United States315.4 250.4 861.4 685.4 
Other (primarily Canada and Latin America)38.9 34.0 118.0 97.5 
Total net sales$747.0 $647.3 $2,189.8 $1,755.8 
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 nine-month period ended September 30, 2021 and 2020 were as follows (in millions):
Nine Months Ended
September 30,
20212020
Balance at beginning of period$9.8 $9.0 
Provision for warranty8.7 5.4 
Actual warranty costs(8.3)(6.1)
Balance at end of period$10.2 $8.3 
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
Changes in our allowance for doubtful accounts were as follows (in millions):
Nine Months Ended
September 30,
20212020
Balance at beginning of period$19.8 $20.2 
Provision for expected credit losses0.6 1.2 
Write-offs charged against the allowance(5.6)(2.1)
 Recoveries collected0.2 0.1 
Balance at end of period$15.0 $19.4