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Fair Value (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Summary of Non-Pension Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present the Company’s non-pension financial assets and liabilities, which are measured at fair value on a recurring basis (in millions):

 

     December 31, 2017     December 31, 2016  
     Fair Value Asset (Liability)     Fair Value Asset (Liability)  
     Level 1      Level 2     Level 3      Total     Level 1      Level 2     Level 3      Total  

Derivatives:

                    

Assets

   $ —        $ 14.9     $ —        $ 14.9     $ —        $ 33.3     $ —        $ 33.3  

Liabilities

     —          (56.7     —          (56.7     —          (36.8     —          (36.8

Investment securities, including mutual funds

     5.2        3.5       —          8.7       4.8        9.9       —          14.7