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External Debt and Financing Arrangements (Tables)
12 Months Ended
Dec. 31, 2017
Components of External Long-Term Debt

The components of external long-term debt were as follows:

 

     
(In millions)    2017      2016  

$400 million unsecured senior note due June 2020

   $ 398.3      $ 397.6  

$500 million unsecured senior note due June 2025

     494.3        493.5  

$1,250 million revolving credit agreement due June 2021

     615.0        540.0  

Total debt

     1,507.6        1,431.1  

Less: current portion

             

Total long-term debt

   $ 1,507.6      $ 1,431.1