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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Components of income before the provision for income taxes and noncontrolling interest
The components of pretax income are summarized as follows (in millions):  
 
Years Ended December 31,
 
2017
 
2016
 
2015
Domestic
$
474.2

 
$
466.2

 
$
456.3

Foreign
337.6

 
361.2

 
395.9

Total pretax income
$
811.8

 
$
827.4

 
$
852.2
Schedule of Components of Provision for Income Taxes
The provision for income taxes is summarized as follows (in millions):  
 
Years Ended December 31,
 
2017
 
2016
 
2015
Current provision:
 

 
 

 
 

Federal
$
594.3

 
$
121.4

 
$
181.4

States
13.9

 
10.3

 
15.9

Foreign
45.4

 
46.0

 
43.3

Total current provision
653.6

 
177.7

 
240.6

Deferred (benefit) provision:
 
 
 
 
 
Federal
(128.7
)
 
57.2

 
(16.7
)
States
(17.7
)
 
4.3

 
(0.4
)
Foreign
(1.6
)
 
(4.5
)
 
(5.0
)
Total deferred (benefit) provision
(148.0
)
 
57.0

 
(22.1
)
Total provision for income taxes
$
505.6

 
$
234.7

 
$
218.5
Schedule of Effective Income Tax Rate Reconciliation
The provision for income taxes differs from the amount computed by applying the federal statutory rate to pretax income as follows (in millions):
 
Years Ended December 31,
 
2017
 
2016
 
2015
Expected provision at 35% rate
$
284.1

 
$
289.6

 
$
298.3

State taxes, net of federal benefit
12.0

 
8.9

 
8.9

Foreign income at different tax rates
(46.4
)
 
(53.4
)
 
(68.9
)
R&D tax credits
(15.1
)
 
(16.8
)
 
(12.7
)
Share-based compensation
—

 
10.5

 
13.2

Release of valuation allowance
(1.7
)
 
(0.7
)
 
—

Domestic production activities
(12.4
)
 
(9.5
)
 
(15.1
)
Non-deductible compensation
1.6

 
2.4

 
3.7

Cost sharing adjustment(*)
—

 
—

 
(13.2
)
Impact of the U.S. Tax Cuts and Jobs Act
289.5

 
—

 
—

Other
(6.0
)
 
3.7

 
4.3

Total provision for income taxes
$
505.6

 
$
234.7

 
$
218.5


________________________________
(*)  
Represents cumulative impact through fiscal year 2014 for the change in treatment of share-based compensation as a result of the U.S. Tax Court decision in Altera Corp. v. Commissioner, 145 T.C. No. 3 (2015).
Schedule of Deferred Tax Assets and Liabilities
Significant components of the Company's long-term deferred tax assets and deferred tax liabilities are as follows (in millions):
 
As of December 31,
 
2017
 
2016
Deferred tax assets:
 

 
 

Net operating loss carry-forwards
$
18.3

 
$
23.8

Research and other credit carry-forwards
198.8

 
137.5

Deferred revenue
103.5

 
125.6

Stock-based compensation
31.1

 
52.3

Cost sharing adjustment
12.4

 
69.9

Reserves and accruals not currently deductible
76.7

 
141.3

Other
12.8

 
12.8

Total deferred tax assets
453.6

 
563.2

Valuation allowance
(214.5
)
 
(154.4
)
Deferred tax assets, net of valuation allowance
239.1

 
408.8

Deferred tax liabilities:
 
 
 
Property and equipment basis differences
(42.5
)
 
(58.1
)
Purchased intangibles
(12.4
)
 
(28.8
)
Unremitted foreign earnings
(25.4
)
 
(311.4
)
Deferred compensation and other
(10.4
)
 
(11.0
)
Total deferred tax liabilities
(90.7
)
 
(409.3
)
Net deferred tax assets (liabilities)
$
148.4

 
$
(0.5
)
Reconciliation of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of the Company's total gross unrecognized tax benefits was as follows (in millions):
 
Years Ended December 31,
 
2017
 
2016
 
2015
Balance at beginning of year
$
223.1

 
$
216.1

 
$
199.2

Tax positions related to current year:
 
 
 
 
 
Additions
64.6

 
27.2

 
18.1

Tax positions related to prior years:
 
 
 
 
 
Additions
1.8

 
1.0

 
5.3

Reductions
(16.6
)
 
(4.1
)
 
(2.9
)
Settlements
(4.0
)
 
(14.3
)
 
—

Lapses in statutes of limitations
(4.4
)
 
(2.8
)
 
(3.6
)
Balance at end of year
$
264.5

 
$
223.1

 
$
216.1