The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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

-Publisher SEC

-Name Regulation 12B

-Number 240

-Section 12b

-Subsection 1

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- Definition

The minimum percentage of the reporting entity's contributions to a multiemployer plan as compared to total contributions.

+ References

No definition available.

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- Definition

Three digit plan number for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA".

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (f)(1)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA".

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (f)(2)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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Employee Benefit Plans (Multiemployer Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
FIP/RP Status Pending or Implemented	No
Company Contributions	$ 11.8	$ 13.4	$ 12.9
Surcharge Imposed	No
Expiration Date of Collective Bargaining Arrangement	May 08, 2016
Steamfitters Industry Pension Fund [Member]
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Yellow	Yellow
FIP/RP Status Pending or Implemented	Implemented
Company Contributions	5.1	4.3	3.5
Surcharge Imposed	No
Expiration Date of Collective Bargaining Arrangement	Jun. 30, 2014
Excavators Union Local 731 Pension Fund [Member]
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
FIP/RP Status Pending or Implemented	No
Company Contributions	5.3	3.2	3.3
Surcharge Imposed	No
Expiration Date of Collective Bargaining Arrangement	Jun. 30, 2016
Carpenters Pension Trust Fund for Northern California [Member]
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Red	Red
FIP/RP Status Pending or Implemented	Implemented
Company Contributions	$ 1.8	$ 2.1	$ 2.3
Surcharge Imposed	No
Expiration Date of Collective Bargaining Arrangement	Jun. 30, 2015
Multiemployer Pension Plans \| Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]
Multiemployer Plans [Line Items]
EIN	136123601
Pension Plan Number	001
Exceeded percentage of total contributions			5.00%
Multiemployer Pension Plans \| Steamfitters Industry Pension Fund [Member]
Multiemployer Plans [Line Items]
EIN	136149680
Pension Plan Number	001
Exceeded percentage of total contributions			5.00%
Multiemployer Pension Plans \| Excavators Union Local 731 Pension Fund [Member]
Multiemployer Plans [Line Items]
EIN	131809825
Pension Plan Number	002
Multiemployer Pension Plans \| Carpenters Pension Trust Fund for Northern California [Member]
Multiemployer Plans [Line Items]
EIN	946050970
Pension Plan Number	001