Income Taxes (Tables)

12 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income before Income Taxes

The significant components of income before income taxes and the consolidated income tax provision were as follows:

	Year Ended September 30
	2018		2017		2016
Income before income taxes:
Domestic	$	101.8	$	129.0	$	92.2
Foreign	95.4		54.0		46.1
Total	$	197.2	$	183.0	$	138.3

Schedule of Income Tax Expense

Income tax expense:
Current provision
U.S. Federal	$	5.9		$	61.6		$	4.7
State	3.5			8.6			2.2
Foreign	20.2			13.3			9.1
Total current provision	29.6			83.5			16.0
Deferred provision:
U.S. Federal	(83.4		)	(34.9		)	21.8
State	(2.8		)	1.3			1.2
Foreign	1.4			0.8			(23.5		)
Total deferred provision	(84.8		)	(32.8		)	(0.5		)
Income tax expense	$	(55.2	)	$	50.7		$	15.5

Reconciliation of Income Tax Expense to Income Tax at Statutory Rate

Differences between income tax expense reported for financial reporting purposes and that computed based upon the application of the statutory U.S. Federal tax rate to the reported income before income taxes were as follows:

	Year Ended September 30
	2018					2017					2016
	Amount			% of Pretax Income		Amount			% of Pretax Income		Amount			% of Pretax Income
U.S. Federal income tax (a)	$	48.4		24.5	%	$	64.1		35.0	%	$	48.4		35.0	%
State income tax (b)	2.9			1.5	%	4.1			2.2	%	2.9			2.1	%
Foreign income tax (c)	(23.3		)	(11.8	)%	(35.6		)	(19.4	)%	(14.0		)	(10.1	)%
Application of federal research tax credits	(5.6		)	(2.9	)%	(3.6		)	(2.0	)%	(5.6		)	(4.0	)%
Application of foreign tax credits	(1.0		)	(0.5	)%	(15.0		)	(8.2	)%	(0.5		)	(0.4	)%
Valuation of tax attributes	23.4			11.9	%	36.3			19.8	%	(14.4		)	(10.4	)%
Foreign inclusions	(0.9		)	(0.4	)%	11.5			6.3	%	0.9			0.6	%
Domestic manufacturer’s deduction	(0.9		)	(0.4	)%	(4.4		)	(2.4	)%	(1.8		)	(1.3	)%
Excess tax benefits from share based awards	(16.1		)	(8.2	)%	(8.9		)	(4.9	)%	—			—	%
U.S. tax benefit of foreign currency loss	(9.2		)	(4.7	)%	—			—	%	—			—	%
U.S. tax reform deferred tax remeasurement	(93.8		)	(47.6	)%	—			—	%	—			—	%
U.S. tax reform transition tax	22.9			11.6	%	—			—	%	—			—	%
Other, net	(2.0		)	(1.0	)%	2.2			1.3	%	(0.4		)	(0.3	)%
Income tax expense	$	(55.2	)	(28.0	)%	$	50.7		27.7	%	$	15.5		11.2	%

(a) At statutory rate.

(b) Net of U.S. Federal benefit.

(c) U.S. Federal tax rate differential.

Schedule of Deferred Taxes

The tax effect of temporary differences that gave rise to the deferred tax balance sheet accounts were as follows:

	Year Ended September 30
	2018			2017
Deferred tax assets:
Employee benefit accruals	$	34.9		$	64.5
Inventory	12.7			16.6
Net operating loss carryforwards	84.5			70.7
Tax credit carryforwards	20.5			23.3
Other, net	26.4			41.4
	179.0			216.5
Less: Valuation allowance	(80.2		)	(58.2		)
Total deferred tax assets	98.8			158.3
Deferred tax liabilities:
Depreciation	(19.2		)	(28.6		)
Amortization	(216.8		)	(349.7		)
Other, net	(9.1		)	(5.3		)
Total deferred tax liabilities	(245.1		)	(383.6		)
Deferred tax asset (liability) - net	$	(146.3	)	$	(225.3	)

Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits

A rollforward of the beginning and ending amount of unrecognized tax benefits is as follows:

	Year Ended September 30
	2018			2017			2016
Balance as of October 1	$	4.5		$	5.1		$	5.8
Increases in tax position of prior years	2.3			0.1			0.8
Decreases in tax position of prior years	—			—			(0.1		)
Increases in tax position during the current year	0.3			—			—
Settlements with taxing authorities	—			—			(0.3		)
Lapse of applicable statute of limitations	(0.9		)	(0.8		)	(0.5		)
Change in positions due to acquisitions	—			—			(0.6		)
Foreign currency adjustments	—			0.1			—
Total change	1.7			(0.6		)	(0.7		)
Balance as of September 30	$	6.2		$	4.5		$	5.1