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Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Goodwill [Roll Forward]          
Goodwill, Beginning Balance     $ 28.7    
Effect of exchange rate changes     (1.2)    
Ending balance 27.5   27.5    
Amortized intangible assets [Abstract]          
Gross Carrying Value 17.9   17.9   18.3
Accumulated Amortization (6.5)   (6.5)   (5.9)
Net Intangible Assets 11.4   11.4   12.4
Amortization Expense 0.4 0.2 0.8 0.4  
Amortization expense, fiscal year maturity [Abstract]          
Remainder of 2015 0.8   0.8    
2016 1.7   1.7    
2017 1.7   1.7    
2018 1.7   1.7    
2019 1.6   1.6    
2020 & Beyond 3.9   3.9    
Trade names [Member]
          
Amortized intangible assets [Abstract]          
Gross Carrying Value 9.8   9.8   10.1
Accumulated Amortization (5.9)   (5.9)   (5.7)
Net Intangible Assets 3.9   3.9   4.4
Acquired technology [Member]
          
Amortized intangible assets [Abstract]          
Gross Carrying Value 5.8   5.8   5.8
Accumulated Amortization (0.5)   (0.5)   (0.2)
Net Intangible Assets 5.3   5.3   5.6
Customer relationships [Member]
          
Amortized intangible assets [Abstract]          
Gross Carrying Value 2.3   2.3   2.4
Accumulated Amortization (0.1)   (0.1)   0
Net Intangible Assets 2.2   2.2   2.4
South America [Member]
          
Goodwill [Roll Forward]          
Goodwill, Beginning Balance     10.9    
Effect of exchange rate changes     (0.8)    
Ending balance 10.1   10.1    
Asia [Member]
          
Goodwill [Roll Forward]          
Goodwill, Beginning Balance     0.5    
Effect of exchange rate changes     0    
Ending balance 0.5   0.5    
Building HVAC [Member]
          
Goodwill [Roll Forward]          
Goodwill, Beginning Balance     17.3    
Effect of exchange rate changes     (0.4)    
Ending balance $ 16.9   $ 16.9