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Financial Instruments - Fair Value Measured on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Significant Unobservable Inputs (Level 3)    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at the ending of the period $ 3.2  
Significant Unobservable Inputs (Level 3) | Maximum    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Liability recorded at acquisition date fair value 4.7  
Fair value measured on a recurring basis    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Liability recorded at acquisition date fair value 3.2  
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Purchases 2.8  
Comprehensive income 0.4  
Balance at the ending of the period 3.2  
Liability recorded at acquisition date fair value $ 3.2  
AVG | Significant Unobservable Inputs (Level 3)    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Liability recorded at acquisition date fair value   $ 2.8