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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Civil Segment Joint Venture [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Additional ownership percentage in joint venture | 25.00% |
Ownership Percentage in Joint Venture | 75.00% | 50.00%
Noncontrolling interest, ownership percentage by noncontrolling owners | 25.00% |
Construction contract backlog |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 75.6 |
Construction contract backlog | Civil Segment Joint Venture [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finite-lived Intangible Assets Acquired | 75.6 |
Joint Venture [Member] | Civil Segment Joint Venture [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying value of investments | 3.2 |
Fair Value, Nonrecurring [Member] | Civil Segment Joint Venture [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain on remeasurment | 37.8 |
Senior Notes [Member] | 2017 Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, fair value | 485.0 | $ 466.8
Convertible Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, fair value | $ 193.4 | $ 184.4

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