Income Taxes (Tables)

12 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

	2017		2016		2015
Components of income before income taxes:
United States	$	547.2	$	512.1	$	660.5
Non-United States	490.2		431.0		467.0
Total	$	1,037.4	$	943.1	$	1,127.5

Schedule of Components of Income Tax Expense (Benefit)

Components of the income tax provision:
Current:
United States	$	67.3		$	175.9		$	238.6
Non-United States	109.9			91.7			73.6
State and local	0.7			16.3			17.0
Total current	177.9			283.9			329.2
Deferred:
United States	44.6			(53.7		)	(30.3		)
Non-United States	(14.1		)	(8.8		)	2.6
State and local	3.3			(8.0		)	(1.6		)
Total deferred	33.8			(70.5		)	(29.3		)
Income tax provision	$	211.7		$	213.4		$	299.9
Total income taxes paid	$	211.9		$	299.8		$	313.1

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation between the U.S. federal statutory rate and our effective tax rate was:

	2017		2016		2015
Statutory tax rate	35.0	%	35.0	%	35.0	%
State and local income taxes	0.7		0.6		0.9
Non-United States taxes	(9.3	)	(8.6	)	(7.9	)
Tax effect of foreign dividends	0.5		0.1		(0.2	)
Foreign currency transaction loss	(1.9	)	(0.8	)	—
Share-based compensation	(2.8	)	—		—
Research and development tax credit	(0.6	)	(2.0	)	(0.6	)
Change in valuation allowances	0.1		(0.6	)	(0.5	)
Domestic manufacturing deduction	(0.9	)	(1.2	)	(1.2	)
Adjustments for prior period tax matters	(0.4	)	0.4		0.5
Other	—		(0.3	)	0.6
Effective income tax rate	20.4	%	22.6	%	26.6	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to our net deferred income tax assets (liabilities) at September 30, 2017 and 2016 were (in millions):

	2017			2016
Deferred income tax assets:
Compensation and benefits	$	18.8		$	16.2
Inventory	20.2			18.0
Returns, rebates and incentives	45.9			55.1
Retirement benefits	305.5			493.6
Environmental remediation and other site-related costs	33.4			34.8
Share-based compensation	32.4			40.6
Other accruals and reserves	71.3			60.5
Net operating loss carryforwards	20.4			24.4
Tax credit carryforwards	15.3			13.7
Capital loss carryforwards	10.3			9.9
Other	11.1			11.4
Subtotal	584.6			778.2
Valuation allowance	(18.6		)	(17.3		)
Net deferred income tax assets	566.0			760.9
Deferred income tax liabilities:
Property	(74.0		)	(63.5		)
Intangible assets	(45.9		)	(54.9		)
Other	(2.5		)	(8.6		)
Deferred income tax liabilities	(122.4		)	(127.0		)
Total net deferred income tax assets	$	443.6		$	633.9

Schedule of Tax Attributes and Valuation Allowances

Tax attributes and related valuation allowances at September 30, 2017 were (in millions):

Tax Attribute to be Carried Forward	Tax Benefit Amount		Valuation Allowance		Carryforward Period Ends
Non-United States net operating loss carryforward	$	6.2	$	5.8	2018	-	2027
Non-United States net operating loss carryforward	4.7		1.7		Indefinite
Non-United States capital loss carryforward	10.3		10.3		Indefinite
United States net operating loss carryforward	1.2		—		2019	-	2033
United States tax credit carryforward	2.2		—		2018	-	2037
State and local net operating loss carryforward	8.3		0.2		2018	-	2037
State tax credit carryforward	13.1		0.6		2019	-	2032
Total	46.0		18.6

Summary of Income Tax Contingencies

A reconciliation of our gross unrecognized tax benefits, excluding interest and penalties, is as follows (in millions):

	2017			2016			2015
Gross unrecognized tax benefits balance at beginning of year	$	32.4		$	43.9		$	38.9
Additions based on tax positions related to the current year	1.9			2.3			2.1
Additions based on tax positions related to prior years	10.8			14.9			11.6
Reductions based on tax positions related to prior years	(0.1		)	—			(1.0		)
Reductions related to settlements with taxing authorities	(7.7		)	(27.1		)	(4.3		)
Reductions related to lapses of statute of limitations	(6.3		)	(1.6		)	(1.6		)
Effect of foreign currency translation	0.1			—			(1.8		)
Gross unrecognized tax benefits balance at end of year	$	31.1		$	32.4		$	43.9