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Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] |  |
Commitments and Contingencies [Line Items] |  |
Self insurance reserve | $ 74.0 | $ 70.3
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member] |  |
Commitments and Contingencies [Line Items] |  |
Self insurance reserve, non-current | 43.9 | 39.6
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Assets [Member] |  |
Commitments and Contingencies [Line Items] |  |
Cash collateral held by insurance carriers | 1.3 | 1.2
Uninsured Risk [Member] | Employee Group Medical Claims Policies [Member] |  |
Commitments and Contingencies [Line Items] |  |
Self insurance reserve | 3.2 | 4.4
Performance and Payment Bonds [Member] |  |
Commitments and Contingencies [Line Items] |  |
Outstanding bonds, amount | 553.7 | 748.3
Performance and Payment Bonds [Member] | Estimate [Member] |  |
Commitments and Contingencies [Line Items] |  |
Bonded projects, costs to complete | 44.1 | 60.1
Surety Bond [Member] | Uninsured Risk [Member] | Workers Compensation [Member] |  |
Commitments and Contingencies [Line Items] |  |
Outstanding bonds, amount | 13.0 | 13.0
Credit Facility [Member] |  |
Commitments and Contingencies [Line Items] |  |
Letters of credit issued | 172.4 | 153.6
Credit Facility [Member] | Financial Guarantees [Member] | Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] |  |
Commitments and Contingencies [Line Items] |  |
Letters of credit issued | $ 74.2 | $ 75.0

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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