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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

X

- 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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X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
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