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Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative contract, net $ 2.6
Fair Value, Recurring | Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative contract, net 0.0
Fair Value, Recurring | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative contract, net 2.6
Fair Value, Recurring | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative contract, net $ 0.0