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Segment Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Segment | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Number of operating business segments |  |  | 2 |
Intersegment profit | $ 15.8 | $ 38.0 | $ (4.1) | $ 39.6
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment profit | (14.7) | (23.5) | (31.0) | (44.7)
Other Technology | Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment profit | $ 0 | $ 2.4 | $ 0.4 | $ 2.7

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration