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Fair Value of Financial Instrument (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   $ 617.1
Derivative assets $ 39.3 24.7
Derivative liabilities 15.0 $ 6.6
1.056% Senior term loan due 2020(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, face amount $ 220.0  
Debt Interest Rate 1.056% 1.056%
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   $ 547.7
Derivative assets $ 0.0 0.0
Derivative liabilities 0.0 0.0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   0.0
Derivative assets 39.3 24.7
Derivative liabilities 15.0 6.6
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   30.5
Derivative assets 0.0 0.0
Derivative liabilities $ 0.0 $ 0.0