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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