Commitments and Contingencies (Tables)

12 Months Ended

May 31, 2016

Other Commitments [Line Items]

Future Minimum Operating Lease Payments

		Minimum
In millions		lease
Year ending May 31,		payments
2017	$	35.7
2018		28.5
2019		20.0
2020		12.9
2021		7.4
Thereafter		2.2

Minimum Future Payment Obligations

	Minimum
In millions	payment
Year ending May 31,	obligation
2017	$	73.5
2018		20.5
2019		7.6
2020		4.4
2021		3.0
Thereafter		0.6

Line of Credit [Member]

Other Commitments [Line Items]

Lines of Credit Facility Amount Available or Amount Borrowed

Financial institution	Amount available	Expiration date
JP Morgan Chase Bank, N.A.	$350 million	February 27, 2017
Bank of America, N.A.	$250 million	February 28, 2017
PNC Bank, National Association	$150 million	February 27, 2017
Wells Fargo Bank, National Association	$150 million	February 27, 2017

Revolving Credit Facility [Member]

Other Commitments [Line Items]

Lines of Credit Facility Amount Available or Amount Borrowed

$ in millions	2016				2015
Number of days borrowed		5			2
Maximum amount borrowed	$	450.0		$	150.0
Average amount borrowed	$	305.0		$	125.0
Weighted-average interest rate		3.39	%		3.25	%