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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Aug. 31, 2014 | May 31, 2014
--- | --- | ---
Available-for-sale securities: |  |  |  |
Available-for-sale securities | $ 2,767.1 |  | $ 3,391.4 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0.2 |  | 65.8 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 2,767.1 |  | 3,391.4 |
Other | 13.8 |  | 12.3 |
Liabilities: |  |  |  |
Other long-term liabilities | 13.8 |  | 12.3 |
Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0.2 |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Other | 13.8 |  | 12.3 |
Liabilities: |  |  |  |
Other long-term liabilities | 13.8 |  | 12.3 |
Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0 |  | 65.8 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 2,767.1 |  | 3,391.4 |
Other | 0 |  | 0 |
Liabilities: |  |  |  |
Other long-term liabilities | 0 |  | 0 |
Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0 |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Other | 0 |  | 0 |
Liabilities: |  |  |  |
Other long-term liabilities | 0 |  | 0 |
Commercial paper [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 6.0 |
Commercial paper [Member] | Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Commercial paper [Member] | Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 6.0 |
Commercial paper [Member] | Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
General obligation municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,664.5 |  | 1,628.5 |
General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 10.9 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,664.5 |  | 1,628.5 |
General obligation municipal bonds [Member] | Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
General obligation municipal bonds [Member] | Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 10.9 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,664.5 |  | 1,628.5 |
General obligation municipal bonds [Member] | Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Pre-refunded municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 124.2 | [1] | 142.8 | [1]
Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 31.2 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 124.2 |  | 142.8 |
Pre-refunded municipal bonds [Member] | Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Pre-refunded municipal bonds [Member] | Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 31.2 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 124.2 |  | 142.8 |
Pre-refunded municipal bonds [Member] | Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Revenue municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 932.7 |  | 867.8 |
Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 17.7 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 932.7 |  | 867.8 |
Revenue municipal bonds [Member] | Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Revenue municipal bonds [Member] | Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 17.7 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 932.7 |  | 867.8 |
Revenue municipal bonds [Member] | Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents |  |  | 0 |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Money market securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0.2 |  |  |
Money market securities [Member] | Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0.2 |  |  |
Money market securities [Member] | Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0 |  |  |
Money market securities [Member] | Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash Equivalents | 0 |  |  |
Variable rate demand notes [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 45.7 |  | 752.3 |
Variable rate demand notes [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 45.7 |  | 752.3 |
Variable rate demand notes [Member] | Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Variable rate demand notes [Member] | Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 45.7 |  | 752.3 |
Variable rate demand notes [Member] | Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | $ 0 |  | $ 0 |
[1] | Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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