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Other Retirement Plans (Schedule of Significant Multi-Employer Pension Plans) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Multi-employer plan, contributions | $ 48.2 |  | $ 29.2 |  | $ 20.7 |
Multi-Employer Plans, Pension [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Multi-employer plan, contributions | 44.6 |  | 27.9 |  | 19.5 |
Multi-Employer Plans, Pension [Member] | Central Pension Fund of IUOE and Participating Employers [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 366052390 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 10.8 |  | 6.0 |  | 4.4 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Jan. 31, 2013 | [1] | Jan. 31, 2012 | [1] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Pipeline Industry Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 736146433 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 9.8 |  | 8.9 |  | 6.2 |
Multi-employer plans, collective bargaining arrangement, expiration date | May 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 | [2] | Dec. 31, 2011 | [2] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Operating Engineers Local 324 Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 381900637 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 4.5 |  | 0.8 |  | 0 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Red |  | Red |  |  |
Multi-employer plans, pension protection act zone status, date | Apr. 30, 2013 |  | Apr. 30, 2012 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented |  |  |  |  |
Multi-employer plans, surcharge status | Yes |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Michigan Laborers Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 386233976 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 4.3 |  | 0.9 |  | 0.2 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Yellow |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Aug. 31, 2013 | [1] | Aug. 31, 2012 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Teamsters National Pipeline Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 461102851 | [3] |  |  |  |
Multi-employer plan number | 001 | [3] |  |  |  |
Multi-employer plan, contributions | 2.7 | [3] | 1.4 | [3] | 0 | [3]
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 | [3] |  |  |  |
Multi-employer plans, pension protection act zone status | Green | [3] | NA | [3] |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 | [2],[3] |  |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA | [3] |  |  |  |
Multi-employer plans, surcharge status | No | [3] |  |  |  |
Multi-Employer Plans, Pension [Member] | Eighth District Electrical Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 846100393 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 2.2 |  | 1.3 |  | 0.5 |
Multi-employer plans, collective bargaining arrangement, expiration date | Feb. 28, 2015 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Mar. 31, 2013 |  | Mar. 31, 2012 | [1] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Laborers National Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 751280827 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 1.1 |  | 1.5 |  | 0.5 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 |  | Dec. 31, 2011 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Laborers District Council and Contractors Pension Fund of Ohio [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 316129964 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.7 |  | 0.1 |  | 0.1 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 |  | Dec. 31, 2011 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Midwest Operating Engineers Pension Trust Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 366140097 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.7 |  | 0 |  | 0 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Yellow |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Mar. 31, 2013 | [1] | Mar. 31, 2012 | [1] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented |  |  |  |  |
Multi-employer plans, surcharge status | Yes |  |  |  |  |
Multi-Employer Plans, Pension [Member] | I.B.E.W. Local 769 Management Pension Plan A [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 866049763 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.7 |  | 0.1 |  | 0 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jul. 30, 2016 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Jun. 30, 2012 |  | Jun. 30, 2011 | [2] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Laborers Local Union No. 158 Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 236580323 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.5 |  | 0.6 |  | 0.7 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 | [2] | Dec. 31, 2011 | [2] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | West Virginia Laborers Pension Trust Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 556026775 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.5 |  | 0.9 |  | 0.4 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | Mar. 31, 2013 |  | Mar. 31, 2012 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Laborers District Council of Western Pennsylvania Pension Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 256135576 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.4 |  | 0.6 |  | 0.3 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Red |  | Yellow |  |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 |  | Dec. 31, 2011 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented |  |  |  |  |
Multi-employer plans, surcharge status | Yes |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Laborers Pension Trust Fund for Northern Nevada [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 880138600 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0.1 |  | 0.2 |  | 0.8 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Green |  | Green |  |  |
Multi-employer plans, pension protection act zone status, date | May 31, 2013 |  | May 31, 2012 | [2] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | NA |  |  |  |  |
Multi-employer plans, surcharge status | No |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Operating Engineers Pension Trust Fund [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 946090764 |  |  |  |  |
Multi-employer plan number | 001 |  |  |  |  |
Multi-employer plan, contributions | 0 |  | 0 |  | 1.2 |
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 |  |  |  |  |
Multi-employer plans, pension protection act zone status | Orange |  | Orange |  |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 |  | Dec. 31, 2011 |  |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented |  |  |  |  |
Multi-employer plans, surcharge status | Yes |  |  |  |  |
Multi-Employer Plans, Pension [Member] | Central States Southeast and Southwest Areas Pension Plan [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Employer identification number | 366044243 | [4] |  |  |  |
Multi-employer plan number | 001 | [4] |  |  |  |
Multi-employer plan, contributions | 0 | [4] | 0 | [4] | 0.9 | [4]
Multi-employer plans, collective bargaining arrangement, expiration date | Jan. 31, 2014 | [4] |  |  |  |
Multi-employer plans, pension protection act zone status | Red | [4] | Red | [4] |  |
Multi-employer plans, pension protection act zone status, date | Dec. 31, 2012 | [4] | Dec. 31, 2011 | [4] |  |
Multi-employer plans, funding improvement plan and rehabilitation plan status | Implemented | [4] |  |  |  |
Multi-employer plans, surcharge status | No | [4] |  |  |  |
Multi-Employer Plans, Pension [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |  |  |  |
Multi-Employer Plans [Line Items] |  |  |  |  |  |
Multi-employer plan, contributions | $ 5.6 |  | $ 4.6 |  | $ 3.3 |
[1] | This plan has utilized extended amortization provisions, which provide plans with extensions of time to amortize pension funding shortfalls.
[2] | The Company’s contributions to this plan represent greater than 5% of the plan's total contributions.
[3] | The Teamsters National Pipeline Pension Fund was established in 2012.
[4] | The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See discussion below and in Note 16 – Commitments and Contingencies.

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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details
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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 + Details
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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 + Details
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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 + Details
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- Definition Date of the multiemployer plan's year end to which the certified zone status relates, 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 (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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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 + Details
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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 + Details
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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 + Details
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