Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of income before income tax and components of Income tax expense (benefit)

Pre-tax income (loss) and the (benefit) provision for income taxes from continuing operations are summarized as follows (in millions):

	Year Ended
	December 31, 2018			December 31, 2017			December 31, 2016
Pre-tax income (loss):
Ireland	$	(109.0	)	$	(454.0	)	$	(3,624.1	)
United States	(428.6		)	(144.9		)	(90.0		)
Other foreign	828.2			879.0			(1,134.2		)
Total pre-tax income (loss)	290.6			280.1			(4,848.3		)
(Benefit) provision for income taxes:
Current:
Ireland	22.7			(8.1		)	0.3
United States	66.4			100.4			93.7
Other foreign	75.1			46.1			26.7
Subtotal	164.2			138.4			120.7
Deferred (credit):
Ireland	(13.9		)	13.1			(549.4		)
United States	7.3			7.8			(12.7		)
Other foreign	2.0			1.2			(394.1		)
Subtotal	(4.6		)	22.1			(956.2		)
Total (benefit) provision for income taxes	$	159.6		$	160.5		$	(835.5	)

Schedule of effective income tax rate reconciliation

A reconciliation of the provision based on the Irish statutory income tax rate to our effective income tax rate is as follows:

	Year Ended
	December 31, 2018		December 31, 2017		December 31, 2016
Provision at statutory rate	12.5	%	12.5	%	12.5	%
Foreign rate differential	(7.1	)	(93.3	)	2.6
State income taxes, net of federal benefit	3.0		(1.4	)	0.1
Provision to return	(1.0	)	9.3		0.3
Tax law changes	(6.2	)	10.3		—
Valuation allowance changes	51.0		17.0		0.8
Change in unrecognized taxes	13.8		22.2		(0.8	)
Permanent differences	(13.0	)	61.8		1.3
Withholding taxes	4.2		17.3		—
Other	(2.3	)	1.6		0.4
Effective income tax rate	54.9	%	57.3	%	17.2	%

Schedule of deferred tax assets and liabilities

The components of our net deferred income tax asset (liability) were as follows:

    

	Year Ended
	December 31, 2018			December 31, 2017
Deferred income tax asset (liability):
Depreciation and amortization	$	(371.2	)	$	(457.8	)
Inventory basis differences	27.8			21.3
Accrued liabilities	87.1			87.9
Allowance for doubtful accounts	3.0			1.5
R&D	58.8			58.9
Loss and credit carryforwards	359.2			292.5
Share-based compensation	19.6			16.2
Federal benefit of unrecognized tax positions	18.2			17.0
Interest carryforwards	76.1			30.5
Unremitted earnings	(8.3		)	(9.3		)
Other, net	6.5			37.5
Subtotal	$	276.8		$	96.2
Valuation allowance (1)	(557.9		)	(407.7		)
Net deferred income tax liability:	$	(281.1	)	$	(311.5	)

(1) The movement in the valuation allowance balance differs from the amount in the effective tax rate reconciliation due to adjustments affecting balance sheet only items and foreign currency.

The above amounts are classified on the Consolidated Balance Sheets as follows (in millions):

	Year Ended
	December 31, 2018			December 31, 2017
Assets	$	1.2		$	10.4
Liabilities	(282.3		)	(321.9		)
Net deferred income tax liability	$	(281.1	)	$	(311.5	)

Summary of income tax contingencies

The following table summarizes the activity related to amounts recorded for uncertain tax positions, excluding interest and penalties (in millions):

	Unrecognized Tax Benefits
Balance at December 31, 2016	$	334.5
Additions:
Positions related to the current year	46.1
Positions related to prior years	77.9
Reductions:
Settlements with taxing authorities	(11.1		)
Lapse of statutes of limitation	(0.1		)
Decrease in prior year positions(1)	(99.4		)
Balance at December 31, 2017	347.9
Additions:
Positions related to the current year	39.4
Positions related to prior years	6.8
Reductions:
Settlements with taxing authorities	(6.5		)
Lapse of statutes of limitation	(1.1		)
Decrease in prior year positions	(6.4		)
Cumulative translation adjustment	(3.0		)
Balance at December 31, 2018	$	377.1

(1) Represents a revision from the prior year presentation to remeasure certain attributes that offset deferred tax assets as a result of the U.S. Tax Act.