Subsequent Event (Details) (Optech Incorporated, Subsequent Event, CAD) In Millions, unless otherwise specified	0 Months Ended
Apr. 29, 2015	Apr. 29, 2015
Optech Incorporated \| Subsequent Event
Subsequent Event [Line Items]
Noncontrolling interest, ownership percentage	49.00%	49.00%
Payments to acquire interest in subsidiaries and affiliates	26.5

The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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