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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2011
Anticipated expenditures relating to completion of construction type contracts |  |  | $ 122.9 |  |
Rental expense | 0.7 | 0.7 | 1.4 | 1.5 |
Minimum annual rental commitments, remaining 2011 | 1.3 |  | 1.3 |  |
Minimum annual rental commitments, 2012 |  |  |  |  | 2.3
Minimum annual rental commitments, 2013 |  |  |  |  | 2.2
Minimum annual rental commitments, 2014 |  |  |  |  | 2.1
Minimum annual rental commitments, 2015 |  |  |  |  | 1.2
Minimum annual rental commitments, thereafter |  |  |  |  | $ 0.7
Partnership Interest [Member] |  |  |  |  |
Equity method investment ownership percentage | 100.00% |  | 100.00% |  |

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