Equity and Other Comprehensive Income (Loss) - Summary of Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization and settlement recognition of net actuarial loss, included in pension cost		$ 4.5		$ 5.2		$ 12.6	$ 11.8
Amortization of prior service costs, Net of Tax		0.4		0.2		1.3	0.2
Available for sale security, net of tax							(1.5)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax							0.5
Parent [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial loss, Pre-Tax Amount	[1],[2]	(5.9)		(6.8)		(16.6)	(15.7)
Amortization of net actuarial loss, Tax	[1],[2]	1.5		1.9		4.3	4.3
Amortization and settlement recognition of net actuarial loss, included in pension cost	[1],[2]	(4.4)		(4.9)		(12.3)	(11.4)
Amortization of prior service costs, Pre-Tax Amount	[1]	(0.5)	[2]	(0.3)	[2]	(1.7)	(0.3)
Amortization of prior service costs, Tax	[1]	0.1	[2]	0.1	[2]	0.4	0.1
Amortization of prior service costs, Net of Tax	[1]	(0.4)	[2]	(0.2)	[2]	(1.3)	(0.2)
Defined Benefit Plans, before Tax	[1]	(6.4)		(7.1)		(18.3)	(16.0)
Defined Benefit Plans, Tax	[1]	1.6		2.0		4.7	4.4
Defined Benefit Plans, Net of Tax	[1]	(4.8)		(5.1)		(13.6)	(11.6)
Available for sale security, before tax	[1],[3]						1.5
Available for sale security, net of tax	[1],[3]						1.5
Total Reclassifications From Other Comprehensive Income Before Tax	[1]	(6.4)		(7.1)		(18.3)	(15.2)
Total Reclassifications From Other Comprehensive Income Tax Portion	[1]	1.6		2.0		4.7	4.6
Total Reclassifications From Other Comprehensive Income Net Of Tax	[1]	$ (4.8)		$ (5.1)		$ (13.6)	(10.6)
Parent [Member] | Foreign Exchange Contract [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1],[4]						(0.7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	[1],[4]						0.2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	[1],[4]						$ (0.5)

[1] Amounts in parentheses indicate charges to earnings. Amounts pertaining to noncontrolling interests are excluded.

[2] Included in the computation of net periodic pension cost. See “Note 5. Retirement Plans” for additional details.

[3] Included in other income (expense), net.

[4] Included in net sales.