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Fair Value Disclosures - Summary of Non-Pension Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, Assets $ 16.5 $ 26.2
Derivatives, Liabilities (19.1) (17.3)
Investment securities, including mutual funds 19.2 1.9
Level 1 [Member] | Fair Value Measurements on Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities, including mutual funds 12.9  
Level 2 [Member] | Fair Value Measurements on Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, Assets 16.5 26.2
Derivatives, Liabilities (19.1) (17.3)
Investment securities, including mutual funds $ 6.3 $ 1.9