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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Components of income (loss) before income taxes, and provision (benefit) for income taxes
The components of income (loss) before income taxes, and the provision (benefit) for income taxes are as follows (in millions):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Income before income taxes
 
 
 
 
 
United States
$
(76.2
)
 
$
(140.5
)
 
$
(167.2
)
Foreign
4.0

 
1.3

 
(1.3
)
Total
(72.2
)
 
(139.2
)
 
(168.5
)
Income tax provision (benefit):
 
 
 
 
 
Current:
 
 
 
 
 
United States
(27.4
)
 
(30.6
)
 
(49.5
)
State
(4.6
)
 
(3.5
)
 
(4.2
)
Foreign
1.4

 
0.7

 
(0.2
)
Total
(30.6
)
 
(33.4
)
 
(53.9
)
Deferred:


 


 


United States
(9.0
)
 
(21.3
)
 
(12.5
)
State
(0.4
)
 
(1.0
)
 
(0.8
)
Foreign
(0.1
)
 
(0.2
)
 
(0.1
)
Total
(9.5
)
 
(22.5
)
 
(13.4
)
Total income tax benefit
$
(40.1
)
 
$
(55.9
)
 
$
(67.3
)
Major differences between federal statutory rate and effective tax rate
Major differences between the federal statutory rate and the effective tax rate are as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Federal statutory rate
35.0
 %
 
35.0
 %
 
35.0
%
Rate of state income taxes, net of federal tax benefit
4.5

 
2.8

 
2.0

Statutory rate other than U.S. statutory rate
0.1

 
0.4

 

Sec. 987 regulation change, federal and state impact

 
1.2

 

U.S. federal research and development credit
3.0

 
1.5

 
1.0

Impacts of U.S. federal tax reform
14.2

 

 

Other, net
(1.2
)
 
(0.7
)
 
1.9

Effective tax rate
55.6
 %
 
40.2
 %
 
39.9
%
Summary of significant components of deferred tax assets and liabilities
The following is a summary of the significant components of the Company’s deferred tax assets and liabilities (in millions):
 
As of December 31,
 
2017
 
2016
Deferred tax assets
 
 
 
Accrued liabilities
$
18.7

 
$
34.1

Investment in Joint Venture
5.3

 

Stock-based compensation
7.3

 
8.7

Transaction costs
5.8

 

Other
6.7

 
8.4

 
43.8

 
51.2

Valuation allowance
(1.3
)
 
(0.5
)
Total deferred assets
42.5

 
50.7

 
 
 
 
Deferred tax liabilities
 
 
 
Intangibles, net
10.2

 
17.7

Inventories
12.8

 
13.0

Property, plant and equipment, net
29.4

 
45.8

Other
0.3

 
1.0

Total deferred tax liabilities
52.7

 
77.5

Net deferred tax liabilities
$
10.2

 
$
26.8

Reconciliation of beginning and ending amount of unrecognized tax benefit
A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows (in millions):
 
As of December 31,
 
2017
 
2016
Beginning of year
$
2.7

 
$
1.5

Gross increases for tax positions of prior years
0.1

 
1.5

Gross decreases for tax positions of prior years

 
(0.2
)
Decreases for settlements with taxing authorities

 
(0.1
)
Decreases for lapse of the applicable statute of limitations
(0.1
)
 

End of year
$
2.7

 
$
2.7