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Quarterly Financial Data (Unaudited) (Details 1) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2013 Western Canada Aboveground Storage Tank Project [Member] | Dec. 31, 2012 Western Canada Aboveground Storage Tank Project [Member] | Jun. 30, 2013 Western Canada Aboveground Storage Tank Project [Member]
Pretax charge on a Canadian project |  |  |  | $ 0.6 | $ 3.3 | $ 3.7
Income tax adjustment amount related to current year | 3.1 |  |  |  |  |
Income tax adjustment amount for prior fiscal years |  |  | 2.1 |  |  |
Income tax adjustment amount related to fourth quarter | $ 0.2 | $ 1.0 |  |  |  |

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