Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ 41.5	$ 25.0	$ 198.2	$ (48.0)
Changes in other comprehensive income, net of tax:
Currency translation adjustment	29.2	11.9	43.3	(1.0)
Pension and postretirement (net of quarter-to-date tax expense of $0.4 and $0.4 and year-to-date tax expense of $1.0 and $1.3)	0.9	1.3	2.7	3.8
Change in net unrealized gain on derivative instruments (net of quarter-to-date tax (benefit) expense of ($0.1) and $0.9 and year-to-date tax (benefit) expense of ($0.1) and $0.7)	0.3	2.4	1.5	0.5
Total changes in other comprehensive income, net of tax	30.4	15.6	47.5	3.3
Consolidated comprehensive income (loss)	71.9	40.6	245.7	(44.7)
Less: Comprehensive income attributable to noncontrolling interests	0.9	0.9	3.2	4.4
Comprehensive income (loss)	$ 71.0	$ 39.7	$ 242.5	$ (49.1)