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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2018
Discontinued Operations [Abstract]  
Disposal Groups, Including Discontinued Operations
Summarized results of the Company's discontinued operations are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2018
 
2017
 
2018
 
2017
Revenues
$
—

 
$
25.8

 
$
—

 
$
51.2

Cost of goods sold
—

 
17.2

 
—

 
34.3

Gross profit
—

 
8.6

 
—

 
16.9

Research and development expenses
—

 
2.0

 
—

 
4.2

Selling and administrative expenses
(0.2
)
 
4.4

 
(0.2
)
 
9.1

Restructuring charges
—

 
0.1

 
—

 
0.2

Operating (income) expenses
(0.2
)
 
6.5

 
(0.2
)
 
13.5

Other expense (income), net
—

 
0.4

 
(0.2
)
 
1.0

Earnings from discontinued operations before taxes (1)
0.2

 
1.7

 
0.4

 
2.4

Provision for (benefit from) income taxes
—

 
0.5

 
0.1

 
(0.6
)
Earnings from discontinued operations, net of tax
$
0.2

 
$
1.2

 
$
0.3

 
$
3.0

(1) The Company's policy is to not allocate interest expense to discontinued operations unless it is directly attributable to the operations. The results of operations of the Timing Device Business and Speaker and Receiver Product Line did not have any such interest expense in the periods presented.

Assets and liabilities of discontinued operations are summarized below:
(in millions)
June 30, 2018
 
December 31, 2017
Assets of discontinued operations:
 
 
 
Receivables
$
0.1

 
$
1.2

Prepaid and other current assets
0.1

 
0.5

Total current assets
0.2

 
1.7

Total assets (1)
$
0.2

 
$
1.7

 
 
 
 
Liabilities of discontinued operations:
 
 
 
Accounts payable
$
—

 
$
0.1

Other current liabilities
1.9

 
5.5

Total current liabilities
1.9

 
5.6

Total liabilities (1)
$
1.9

 
$
5.6

(1) In connection with the sale of the Timing Device Business, the Company retained certain obligations related to employees of the Timing Device Business. This arrangement results in maintaining asset and liability balances, which are expected to be settled during the current fiscal year.

The following table presents the depreciation, amortization, and capital expenditures related to discontinued operations:
 
Six Months Ended June 30,
(in millions)
2018
 
2017
Depreciation
$
—

 
$
1.3

Amortization of intangible assets
—

 
0.7

Capital expenditures
—

 
1.5