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Fair Value Disclosures (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Summary of Non-Pension Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents the Company’s non-pension financial assets and liabilities, which are measured at fair value on a recurring basis, as of the dates indicated (in millions):

 

     March 31, 2018     December 31, 2017  
     Fair Value Asset (Liability)     Fair Value Asset (Liability)  
     Level 1      Level 2     Level 3      Total     Level 1      Level 2     Level 3      Total  

Derivatives:

                    

Assets

   $ —      $ 12.1     $ —      $ 12.1     $ —      $ 14.9     $ —      $ 14.9  

Liabilities

     —        (57.8     —        (57.8     —        (56.7     —        (56.7

Investment securities, including mutual funds

     5.2        2.6       —        7.8       5.2        3.5       —        8.7