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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 04, 2019 | Feb. 26, 2015 | Mar. 31, 2016 | Jun. 30, 2015 | Aug. 31, 2013 | Mar. 31, 2012 | Sep. 30, 2019 | Jul. 02, 2018 | Mar. 31, 2018 | May 31, 2012 | Sep. 30, 2011 | Feb. 28, 2006
George Washington Bridge Bus Station Matter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of claim filed |  |  |  |  |  |  |  | $ 113.0 |  |  |  |
George Washington Bridge Bus Station Matter [Member] | Return Of Retainage By Developer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of counterclaim filed |  |  |  |  |  |  |  |  | $ 29.0 |  |  |
Long Island Expressway/Cross Island Parkway Matter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated value of project completed in Feb. 2006 |  |  |  |  |  |  |  |  |  |  |  | $ 130.0
Value of claim filed |  |  |  |  |  | $ 50.7 |  |  |  |  |  |
Amount receivable as per final agreement |  |  |  |  |  |  |  |  |  |  | $ 0.5 |
Value of counterclaim filed |  |  |  |  |  |  |  |  |  | $ 151.0 |  |
Alaska Way Viaduct Matter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  |  |  | 45.00% |  |  |  |  |
Value of claim filed |  |  | $ 57.2 | $ 532.0 |  |  |  |  |  |  |  |
Value of counterclaim filed |  |  | $ 667.0 |  |  |  |  |  |  |  |  |
George Washington Bridge Bus Station Matter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of claim filed |  | $ 30.0 |  |  |  |  |  |  |  |  |  |
Value of project |  |  |  |  | $ 100.0 |  |  |  |  |  |  |
Court issued writ of attachment, amount | $ 23.0 |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | George Washington Bridge Bus Station Matter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of counterclaim filed |  |  |  |  |  |  |  |  | $ 113.0 |  |  |

X
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