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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Estimate of Fair Value Measurement      
Derivative [Line Items]      
Long-term debt value $ 270.8   $ 154.6
Reported Value Measurement      
Derivative [Line Items]      
Long-term debt value 224.1   $ 154.6
Not Designated as Hedging Instrument | Foreign currency contracts      
Derivative [Line Items]      
Open foreign currency forward contracts designated as cash flow hedges, U.S. dollar equivalent 42.7    
Designated as Hedging Instrument | Foreign currency contracts      
Derivative [Line Items]      
Net after-tax loss position 0.2    
Open foreign currency forward contracts designated as cash flow hedges, U.S. dollar equivalent $ 6.2    
Designated as Hedging Instrument | Foreign currency contracts | Forecast      
Derivative [Line Items]      
Loss on derivative   $ 0.2