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Fair Value of Financial Instrument (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   $ 691.8
Derivative assets $ 24.7 7.8
Derivative liabilities $ 6.6 $ 17.0
1.056% Senior term loan due 2020(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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   $ 617.6
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 24.7 7.8
Derivative liabilities 6.6 17.0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   27.8
Derivative assets 0.0 0.0
Derivative liabilities $ 0.0 $ 0.0