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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets Held-in-trust, Noncurrent $ 26.0 $ 27.2
Derivative Asset 5.4  
Derivative Liability   (10.7)
Financial Liabilities Fair Value Disclosure   (10.7)
Total financial assets 31.4 27.2
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets Held-in-trust, Noncurrent 26.0 27.2
Derivative Asset 0.0  
Derivative Liability   0.0
Financial Liabilities Fair Value Disclosure   0.0
Total financial assets 26.0 27.2
Significant observable inputs (Level 2)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets Held-in-trust, Noncurrent 0.0 0.0
Derivative Asset 5.4  
Derivative Liability   (10.7)
Financial Liabilities Fair Value Disclosure   (10.7)
Total financial assets 5.4 0.0
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Assets Held-in-trust, Noncurrent 0.0 0.0
Derivative Asset 0.0  
Derivative Liability   0.0
Financial Liabilities Fair Value Disclosure   0.0
Total financial assets $ 0.0 $ 0.0