Leases (Annual Future Lease Commitments) (Details) - May. 31, 2015 - USD ($) $ in Millions	Total
Leases [Abstract]
Capital lease, 2016	$ 5.7
Capital lease, 2017	5.9
Capital lease, 2018	6.0
Capital lease, 2019	6.1
Capital lease, 2020	6.1
Capital lease, Thereafter	55.0
Capital lease, Total future lease commitments	84.8
Capital lease, Less imputed interest (at 6.5%)	(30.3)
Capital lease, Present value of future lease commitments	54.5
Capital lease, Less current maturities	(2.4)
Obligations under capital leases, net of current installments	52.1
Financing lease, 2016	6.6
Financing lease, 2017	6.8
Financing lease, 2018	6.9
Financing lease, 2019	7.0
Financing lease, 2020	7.2
Financing lease, Thereafter	117.7
Financing lease, Total future lease commitments	152.2
Financing lease, Less imputed interest (various)	(76.9)
Financing lease, Present value of future lease commitments	75.3
Financing lease, Less current maturities	(1.2)
Obligations under financing leases, net of current maturities	74.1
Operating lease, 2016	189.8
Operating lease, 2017	180.1
Operating lease, 2018	165.6
Operating lease, 2019	147.2
Operating lease, 2020	128.7
Operating lease, Thereafter	360.9
Operating lease, Total future lease commitments	$ 1,172.3
Capital lease, imputed interest (percentage)	6.50%

Capital lease imputed interest rate.

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Financing Lease Obligations, Current

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Financing Lease Obligations, Noncurrent

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- Definition

Financing Leases, Future Minimum Payments Due

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Financing Leases, Future Minimum Payments Due, Due Thereafter

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Financing Leases, Future Minimum Payments Due, Due in Five Years

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Financing Leases, Future Minimum Payments Due, Due in Four Years

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Financing Leases, Future Minimum Payments Due, Due in Three Years

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Financing Leases, Future Minimum Payments Due, Due in Two Years

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Financing Leases, Future Minimum Payments Due, Next Twelve Months

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Financing Leases, Future Minimum Payments, Interest Included in Payments

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Financing Leases, Future Minimum Payments, Present Value of Net Minimum Payments

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- Definition

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 50

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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