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Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2012 | Nov. 30, 2011 | Nov. 30, 2012 | Nov. 30, 2011 | May 31, 2012
Financing Arrangements |  |  |  |  |
Total debt | $ 778.9 |  | $ 778.9 |  | $ 792.2
Current maturities of debt | (106.6) |  | (106.6) |  | (122.8)
Long-term debt | 672.3 |  | 672.3 |  | 669.4
Loss on extinguishment of debt | 0.1 |  | 0.3 |  |
Face value of long-term debt | 794.2 |  | 794.2 |  |
Estimated fair value of long-term debt | 793.1 |  | 793.1 |  |
Long-term debt: |  |  |  |  |
Principal amount | 794.2 |  | 794.2 |  |
Net carrying amount | 778.9 |  | 778.9 |  | 792.2
Interest expense |  |  |  |  |
Amortization of discount |  |  | 5.7 | 6.5 |
Revolving credit facility expiring April 12, 2016 with interest payable monthly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 300.0 |  | 300.0 |  | 280.0
Long-term debt: |  |  |  |  |
Net carrying amount | 300.0 |  | 300.0 |  | 280.0
Note payable due July 19, 2012 with interest at 7.22%, payable monthly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Interest rate (as a percent) | 7.22% |  | 7.22% |  |
Total debt |  |  |  |  | 8.4
Debt repayment |  |  | 8.4 |  |
Long-term debt: |  |  |  |  |
Net carrying amount |  |  |  |  | 8.4
Note payable due March 15, 2014 with floating interest rate, payable monthly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 1.9 |  | 1.9 |  | 2.6
Long-term debt: |  |  |  |  |
Net carrying amount | 1.9 |  | 1.9 |  | 2.6
Note payable due March 9, 2017 with floating interest rate, payable quarterly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 45.0 |  | 45.0 |  | 50.0
Long-term debt: |  |  |  |  |
Net carrying amount | 45.0 |  | 45.0 |  | 50.0
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% |  | 7.25% |  |
Total debt | 172.1 |  | 172.1 |  | 172.1
Long-term debt: |  |  |  |  |
Net carrying amount | 172.1 |  | 172.1 |  | 172.1
Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 with interest at 5.01% |  |  |  |  |
Financing Arrangements |  |  |  |  |
Interest rate (as a percent) | 5.01% |  | 5.01% |  |
Total debt | 11.0 |  | 11.0 |  | 11.0
Long-term debt: |  |  |  |  |
Net carrying amount | 11.0 |  | 11.0 |  | 11.0
Convertible notes payable |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 194.0 |  | 194.0 |  | 209.5
Face value of long-term debt | 206.4 |  | 206.4 |  | 229.3
Long-term debt: |  |  |  |  |
Principal amount | 206.4 |  | 206.4 |  | 229.3
Unamortized discount | (12.4) |  | (12.4) |  | (19.8)
Net carrying amount | 194.0 |  | 194.0 |  | 209.5
Equity component, net of tax | 74.8 |  | 74.8 |  | 74.8
Interest expense |  |  |  |  |
Coupon interest | 1.0 | 1.2 | 2.0 | 2.4 |
Amortization of deferred financing fees | 0.1 | 0.2 | 0.3 | 0.4 |
Amortization of discount | 2.8 | 3.3 | 5.6 | 6.5 |
Interest expense related to convertible notes | 3.9 | 4.7 | 7.9 | 9.3 |
Convertible notes payable due February 1, 2026 with interest at 1.75% payable semi-annually on February 1 and August 1 |  |  |  |  |
Financing Arrangements |  |  |  |  |
Interest rate (as a percent) | 1.75% |  | 1.75% |  |
Total debt | 87.2 |  | 87.2 |  | 94.9
Amount of convertible notes repurchased |  |  | 11.0 |  |
Cash paid for convertible notes repurchased |  |  | 11.0 |  |
Long-term debt: |  |  |  |  |
Net carrying amount | 87.2 |  | 87.2 |  | 94.9
Effective interest rate (as a percent) |  |  | 8.48% |  |
Convertible notes payable due March 1, 2014 with interest at 1.625% payable semi-annually on March 1 and September 1 |  |  |  |  |
Financing Arrangements |  |  |  |  |
Interest rate (as a percent) | 1.625% |  | 1.625% |  |
Total debt | 64.3 |  | 64.3 |  | 68.5
Amount of convertible notes repurchased |  |  | 6.4 |  |
Cash paid for convertible notes repurchased |  |  | 6.1 |  |
Long-term debt: |  |  |  |  |
Net carrying amount | 64.3 |  | 64.3 |  | 68.5
Effective interest rate (as a percent) |  |  | 6.82% |  |
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% |  |
Total debt | 42.5 |  | 42.5 |  | 46.1
Amount of convertible notes repurchased |  |  | 5.5 |  |
Cash paid for convertible notes repurchased |  |  | 4.9 |  |
Long-term debt: |  |  |  |  |
Net carrying amount | 42.5 |  | 42.5 |  | 46.1
Effective interest rate (as a percent) |  |  | 7.41% |  |
Industrial revenue bond (secured by trust indenture on property, plant and equipment) due August 1, 2018 with floating interest rate, payable monthly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 25.0 |  | 25.0 |  | 25.0
Long-term debt: |  |  |  |  |
Net carrying amount | 25.0 |  | 25.0 |  | 25.0
Revolving credit facility (secured by aircraft and related engines and components) due April 23, 2015 with floating interest rate, payable monthly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 29.3 |  | 29.3 |  | 33.0
Long-term debt: |  |  |  |  |
Net carrying amount | 29.3 |  | 29.3 |  | 33.0
Revolving credit facility subject to annual review in March with interest payable quarterly |  |  |  |  |
Financing Arrangements |  |  |  |  |
Total debt | 0.6 |  | 0.6 |  | 0.6
Long-term debt: |  |  |  |  |
Net carrying amount | $ 0.6 |  | $ 0.6 |  | $ 0.6

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