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General (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Sale of AIAC Air Conditioning South Africa (Pty) Ltd [Abstract]          
Loss on sale of assets $ (1.7) $ 0.0 $ (1.7) $ 0.0  
ASSETS [Abstract]          
Inventories 210.6   210.6   $ 191.3
Other current assets 68.4   68.4   70.1
Deferred income taxes 99.7   99.7   96.9
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]          
Deferred income taxes 8.7   8.7   9.9
Retained earnings 447.8   447.8   394.9
New Accounting Guidance [Member]          
ASSETS [Abstract]          
Inventories         189.3
Other current assets         64.8
Deferred income taxes         96.7
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]          
Deferred income taxes         10.0
Retained earnings         387.3
AIAC Air Conditioning South Africa (Pty) Ltd [Member]          
Sale of AIAC Air Conditioning South Africa (Pty) Ltd [Abstract]          
Selling price 0.5   $ 0.5    
Loss on sale of assets (1.7)        
Loss on write-off of accumulated foreign currency translation (0.8)        
AIAC Air Conditioning South Africa (Pty) Ltd [Member] | Maximum [Member]          
Sale of AIAC Air Conditioning South Africa (Pty) Ltd [Abstract]          
Annual net sales attributable to disposed business $ 2.0        
ASU 2014-09 [Member] | New Accounting Guidance [Member]          
ASSETS [Abstract]          
Inventories         (2.0)
Other current assets         3.0
Deferred income taxes         (0.2)
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]          
Deferred income taxes         0.1
Retained earnings         0.7
ASU 2016-16 [Member] | New Accounting Guidance [Member]          
ASSETS [Abstract]          
Inventories         0.0
Other current assets         (8.3)
Deferred income taxes         0.0
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]          
Deferred income taxes         0.0
Retained earnings         $ (8.3)