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Financing Arrangements (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2015
May 31, 2015
May 31, 2016
May 31, 2015
May 31, 2014
Mar. 24, 2015
Apr. 12, 2011
Financing Arrangements              
Total debt     $ 150.1   $ 154.0    
Current maturities of debt   $ (69.0) (12.0) $ (69.0)      
Debt issuance costs, net   (2.6) (2.0) (2.6)      
Long-term debt   82.4 136.1 82.4      
Aggregate par value of debt maturing in next five fiscal years              
2017     10.0        
2019     25.0        
2020     110.0        
Short-term borrowing activity              
Loss on extinguishment of debt   44.9 $ 0.4 44.9      
Credit Facility Amendment              
Aggregate par value of debt maturing in next five fiscal years              
Maximum borrowing capacity under the credit agreement before amendment             $ 475.0
Extended maturity period     2 years        
Short-term borrowing activity              
Maximum borrowing capacity           $ 500.0  
Capital lease obligations              
Financing Arrangements              
Total debt     $ 5.1        
Aggregate par value of debt maturing in next five fiscal years              
New capital leases related to new aircraft and IT equipment     5.1        
Revolving Credit Facility expiring March 24, 2020 with interest payable monthly              
Financing Arrangements              
Total debt   50.0 $ 110.0 50.0      
Revolving Credit Facility expiring March 24, 2020 with interest payable monthly | Eurodollar rate | Minimum              
Aggregate par value of debt maturing in next five fiscal years              
Basis spread on variable rate under the credit agreement after amendment (as a percent)     1.00%        
Revolving Credit Facility expiring March 24, 2020 with interest payable monthly | Eurodollar rate | Maximum              
Aggregate par value of debt maturing in next five fiscal years              
Basis spread on variable rate under the credit agreement after amendment (as a percent)     2.00%        
Revolving Credit Facility expiring March 24, 2020 with interest payable monthly | Base rate | Minimum              
Aggregate par value of debt maturing in next five fiscal years              
Basis spread on variable rate under the credit agreement after amendment (as a percent)     0.00%        
Revolving Credit Facility expiring March 24, 2020 with interest payable monthly | Base rate | Maximum              
Aggregate par value of debt maturing in next five fiscal years              
Basis spread on variable rate under the credit agreement after amendment (as a percent)     1.00%        
Industrial revenue bond (secured by property, plant and equipment) due August 1, 2018 with interest payable monthly              
Financing Arrangements              
Total debt   25.0 $ 25.0 25.0      
Note payable due March 9, 2017 with floating interest rate, payable semi-annually on June 1 and December 1              
Financing Arrangements              
Total debt   $ 20.0 10.0 20.0      
Secured credit facility (secured by aircraft and related engines and components) due April 23, 2015 with floating interest rate, payable monthly              
Short-term borrowing activity              
Amount outstanding     4.4        
Notes payable due January 15, 2022 with interest at 7.25% payable semi-annually on January 15 and July 15              
Financing Arrangements              
Interest rate (as a percent) 7.25%            
Short-term borrowing activity              
Redemption value of senior notes $ 325.0            
Redemption value including make-whole premium 370.6            
Loss on extinguishment of debt 44.9            
Make-whole premium of redeemed notes 45.6            
Unamortized deferred financing cost 6.2            
Unamortized deferred cost offset $ 6.9            
Convertible notes payable              
Interest expense              
Coupon interest     0.6 1.5 3.1    
Amortization of deferred financing fees     0.1 0.1 0.3    
Amortization of discount     1.3 2.4 5.1    
Interest expense related to convertible notes     $ 2.0 $ 4.0 8.5    
Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1              
Financing Arrangements              
Interest rate (as a percent)   2.25% 2.25% 2.25%      
Total debt   $ 48.0   $ 48.0      
Mortgage loan due August 1, 2015              
Financing Arrangements              
Total debt   $ 11.0   11.0      
Variable rate and fixed rate debt | Significant other unobservable inputs (Level 3)              
Aggregate par value of debt maturing in next five fiscal years              
Estimated fair value of long-term debt     $ 145.0        
Credit Agreement and its Predecessor              
Short-term borrowing activity              
Maximum amount borrowed     200.0 215.0 190.0    
Average daily borrowings     $ 134.2 $ 140.7 $ 135.8    
Average interest rate during the year (as a percent)   1.69% 1.41% 1.69% 1.77%    
Revolving credit facility | Credit Facility Amendment              
Aggregate par value of debt maturing in next five fiscal years              
Increase in borrowing capacity     $ 250.0        
Total borrowing capacity     $ 750.0