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Investment in Affiliate (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Schedule of Equity Method Investments [Line Items]      
Equity method investment, percent owned (in hundredths) 20.00%    
Earnings (loss) from equity method investments $ 0.7 $ 0.3 $ (0.1)
Nikkei Heat Exchanger [Member]
     
Schedule of Equity Method Investments [Line Items]      
Equity method investment, percent owned (in hundredths) 50.00%    
Equity method investment 3.4 3.3  
Earnings (loss) from equity method investments $ 0.7 $ 0.3 $ (0.1)