Schedule II Valuation and Qualifying Accounts and Reserves Schedule II (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2016	May 31, 2015	May 31, 2014
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 14.9	$ 15.6	$ 18.0
Expensed		12.3	10.6	7.3
Write-Offs and Other		11.1	11.3	9.7
Balance at End of Year		16.1	14.9	15.6
Reserve For Return [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		27.9	27.0	26.0
Expensed		56.6	53.9	56.5
Write-Offs and Other	[1]	52.4	53.0	55.5
Balance at End of Year		32.1	27.9	27.0
Reserves for obsolescence [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		81.1	81.8	83.8
Expensed		12.0	21.7	23.7
Write-Offs and Other		19.2	22.4	25.7
Balance at End of Year		73.9	81.1	81.8
Reserve for royalty advances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		86.8	85.3	79.5
Expensed		4.1	3.6	6.5
Write-Offs and Other		0.8	2.1	0.7
Balance at End of Year		$ 90.1	$ 86.8	$ 85.3

[1] Represents actual returns charged to the reserve