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Financing Arrangements (Tables)
 12 Months Ended
May 31, 2014
Financing Arrangements  
Summary of carrying amount of debt
  May 31,  
 
   2014   2013  

Revolving credit facility expiring April 24, 2018 with interest payable monthly

   $ 130.0   $ 120.0  

Secured credit facility (secured by aircraft and related engines and components) due April 23, 2015 with floating interest rate, payable monthly

     29.9     39.2  

Note payable due March 9, 2017 with floating interest rate, payable semi-annually on June 1 and December 1

     30.0     40.0  

Notes payable due January 15, 2022 with interest at 7.25% payable semi-annually on January 15 and July 15

     332.6     333.4  

Convertible notes payable due March 1, 2014 with interest at 1.625% payable semi-annually on March 1 and September 1

     —     65.9  

Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1

     45.7     43.5  

Other1

     65.8     66.6  
           
​ ​ ​ ​ ​ ​ ​ ​

Total debt

     634.0     708.6  

Current maturities of debt

     (69.7 )   (86.4 )
           
​ ​ ​ ​ ​ ​ ​ ​

Long-term debt

   $ 564.3   $ 622.2  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
1
Included in Other is a mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 of $11.0 million and $11.0 million, 1.75% convertible notes due February 1, 2015 of $29.8 million and $29.4 million, and an industrial revenue bond (secured by property, plant and equipment) due August 1, 2018 of $25.0 million and $25.0 million at May 31, 2014 and 2013, respectively.
Schedule of borrowing activity under the Credit Agreement
 
   For the Year Ended May 31,  
 
   2014   2013   2012  

Maximum amount borrowed

   $ 190.0   $ 395.0   $ 525.0  

Average daily borrowings

     135.8     312.3     288.3  

Average interest rate during the year

     1.77 %   2.03 %   1.90 %
Schedule of retirement of debt
 
   Principal
Amount		   Cash Paid   Loss on
Repurchase		  
 
   2013   2012   2013   2012   2013   2012  

1.625% convertible notes due March 1, 2014

   $ 6.4   $ 9.4   $ 6.1   $ 8.9   $ 0.1   $ 0.2  

2.25% convertible notes due March 1, 2016

     5.5     9.1     4.9     8.1     0.2     0.3  

1.75% convertible notes due February 1, 2026

     11.0     20.6     11.0     20.3     —     0.2  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 22.9   $ 39.1   $ 22.0   $ 37.3   $ 0.3   $ 0.7  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           
Schedule of long-term debt and equity component (recorded in capital surplus, net of income tax benefit) of convertible notes
  May 31,  
 
   2014   2013  

Long-term debt:

              

Principal amount

   $ 79.8   $ 148.3  

Unamortized discount

     (4.4 )   (9.5 )
           
​ ​ ​ ​ ​ ​ ​ ​

Net carrying amount

   $ 75.4   $ 138.8  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

Equity component, net of tax

   $ 75.3   $ 75.3  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of discount on the liability component of long-term debt is being amortized using the effective interest method based on an effective rate
  May 31,  
 
   2014   2013  

1.75% convertible notes due February 1, 2015

     5.00 %   5.00 %

2.25% convertible notes due March 1, 2016

     7.41 %   7.41 %
Schedule of interest expense associated with the convertible notes

  For the Year
Ended May 31,		  
 
   2014   2013   2012  

Coupon interest

   $ 3.1   $ 3.7   $ 4.9  

Amortization of deferred financing fees

     0.3     0.5     0.7  

Amortization of discount

     5.1     9.3     13.1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Interest expense related to convertible notes

   $ 8.5   $ 13.5   $ 18.7  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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