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Fair Value Measurements (Schedule of Marketable Securities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
Jul. 01, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost Basis $ 1.3   $ 1.6
Aggregate Fair Value - Short term marketable securities 0.0   0.3
Aggregate Fair Value - Long term marketable securities 1.2   1.2
Aggregate Fair Value - Total marketable securities 1.2   1.5
Certificates of Deposit      
Debt Securities, Available-for-sale [Line Items]      
Aggregate Fair Value - Short term marketable securities     0.3
Aggregate Fair Value - Long term marketable securities     1.2
Certificates of Deposit | Short Term Marketable Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost Basis     0.3
Maturities   7 months 6 days  
Certificates of Deposit | Long Term Marketable Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost Basis     1.3
Maturities   2 years 9 months 18 days  
Short Term Marketable Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost Basis     0.3
Aggregate Fair Value - Short term marketable securities     0.3
Financial Certificates Of Deposit      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost Basis 1.3    
Aggregate Fair Value - Long term marketable securities $ 1.2    
Maturities 2 years 1 month 6 days    
Long Term Marketable Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost Basis     1.3
Aggregate Fair Value - Long term marketable securities     $ 1.2