RESTRUCTURING - Restructuring Charges and Related Reserve Associated with Fuel for Growth (Details) - Fuel for Growth - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	$ 27.5	$ 19.8
Restructuring Charges	9.9	8.8
Cash Payments for Restructuring	(10.1)	(7.5)
Restructuring Reserve, Ending Balance	27.3	21.1
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	14.2	9.5
Cash Payments for Restructuring	(6.3)	(6.9)
Restructuring Reserve, Ending Balance	15.8	10.8
Restructuring and Related Cost, Payment Period			12 months
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	10.3	10.3
Cash Payments for Restructuring	3.5	0.0
Restructuring Reserve, Ending Balance	6.8	10.3
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	3.0	0.0
Cash Payments for Restructuring	(0.3)	(0.6)
Restructuring Reserve, Ending Balance	4.7	0.0
Other Operating (Income) Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	9.9	9.1
Other Operating (Income) Expense | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7.9	8.2
Other Operating (Income) Expense | Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.0	0.0
Other Operating (Income) Expense | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.0	0.6
Other Operating (Income) Expense | Asset Write-off [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0.0	$ 0.3