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General (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Sale of AIAC Air Conditioning South Africa (Pty) Ltd [Abstract]            
Loss on sale of assets $ 0.0   $ 0.0 $ (1.7) $ 0.0  
ASSETS [Abstract]            
Inventories 211.0     211.0   $ 191.3
Other current assets 71.7     71.7   70.1
Deferred income taxes 96.5     96.5   96.9
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]            
Deferred income taxes 9.1     9.1   9.9
Retained earnings $ 465.8     $ 465.8   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        
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)