Condensed Consolidated Statement of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income
Net (loss) income	$ (236.4)	$ 214.7
Other comprehensive income (loss), net of tax:
Pension and other postretirement benefit plan adjustments (net of tax expense of $7.4 and $12.8)	20.2	24.5
Currency translation adjustments	(16.1)	(86.2)
Net change in unrealized gains and losses on cash flow hedges (net of tax (benefit) expense of ($0.3) and $4.0)	0.5	11.6
Net change in unrealized gains and losses on available-for-sale investments (net of tax benefit of $0.3 and $0.0)	(1.1)	0.0
Other comprehensive income (loss)	3.5	(50.1)
Comprehensive (loss) income	$ (232.9)	$ 164.6