RESTRUCTURING ACTIVITIES (Liabilities for Initiatives and Changes) (Details) - SCAE Plan $ in Millions	9 Months Ended
	Feb. 28, 2016 USD ($)
Restructuring Cost and Reserve [Roll Forward]
Balance at Beginning of Period	$ 32.3
Costs Incurred and Charged to Expense	161.0
Costs Paid or Otherwise Settled	(56.5)
Changes in Estimates	(2.1)
Balance at End of Period	134.7
Multi-employer pension costs
Restructuring Cost and Reserve [Roll Forward]
Balance at Beginning of Period	11.4
Costs Incurred and Charged to Expense	30.0
Costs Paid or Otherwise Settled	(0.7)
Changes in Estimates	0.0
Balance at End of Period	40.7
Severance
Restructuring Cost and Reserve [Roll Forward]
Balance at Beginning of Period	16.4
Costs Incurred and Charged to Expense	78.6
Costs Paid or Otherwise Settled	(28.8)
Changes in Estimates	(1.6)
Balance at End of Period	64.6
Consulting
Restructuring Cost and Reserve [Roll Forward]
Balance at Beginning of Period	0.2
Costs Incurred and Charged to Expense	43.1
Costs Paid or Otherwise Settled	(19.4)
Changes in Estimates	0.0
Balance at End of Period	23.9
Contract cancellation
Restructuring Cost and Reserve [Roll Forward]
Balance at Beginning of Period	3.1
Costs Incurred and Charged to Expense	3.3
Costs Paid or Otherwise Settled	(1.7)
Changes in Estimates	(0.5)
Balance at End of Period	4.2
Other costs
Restructuring Cost and Reserve [Roll Forward]
Balance at Beginning of Period	1.2
Costs Incurred and Charged to Expense	6.0
Costs Paid or Otherwise Settled	(5.9)
Changes in Estimates	0.0
Balance at End of Period	$ 1.3