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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Other comprehensive loss [Abstract]        
Beginning balance     $ 487.9  
Other comprehensive income (loss) before reclassifications $ 17.6 $ (19.3) 23.7 $ (18.4)
Reclassifications for amortization of unrecognized net loss [1] 1.7 1.4 3.3 2.8
Reclassifications for realized losses - net [2] 0.3 0.3 0.8 0.2
Foreign currency translation gains   (0.6) [3]   (0.6)
Income taxes (0.6) (0.2) (1.3) (0.2)
Total other comprehensive income (loss) 19.0 (18.4) 26.5 (16.2)
Ending balance 515.8   515.8  
Nikkei Heat Exchanger Company, Ltd [Member]        
Other comprehensive loss [Abstract]        
Gain (loss) on write-off of accumulated foreign currency translation   0.6    
Accumulated Other Comprehensive Loss [Member]        
Other comprehensive loss [Abstract]        
Beginning balance (215.8) (176.2) (223.3) (178.4)
Ending balance (196.8) (194.6) (196.8) (194.6)
Foreign Currency Translation [Member]        
Other comprehensive loss [Abstract]        
Beginning balance (56.1) (40.7) (61.4) (42.6)
Other comprehensive income (loss) before reclassifications 17.3 (18.7) 22.6 (16.8)
Reclassifications for amortization of unrecognized net loss [1] 0.0 0.0 0.0 0.0
Reclassifications for realized losses - net [2] 0.0 0.0 0.0 0.0
Foreign currency translation gains   (0.6) [3]   (0.6)
Income taxes 0.0 0.0 0.0 0.0
Total other comprehensive income (loss) 17.3 (19.3) 22.6 (17.4)
Ending balance (38.8) (60.0) (38.8) (60.0)
Defined Benefit Plans [Member]        
Other comprehensive loss [Abstract]        
Beginning balance (159.7) (135.2) (160.9) (136.3)
Other comprehensive income (loss) before reclassifications 0.0 0.0 0.0 0.0
Reclassifications for amortization of unrecognized net loss [1] 1.7 1.4 3.3 2.8
Reclassifications for realized losses - net [2] 0.0 0.0 0.0 0.0
Foreign currency translation gains   0.0 [3]   0.0
Income taxes (0.4) (0.3) (0.8) (0.6)
Total other comprehensive income (loss) 1.3 1.1 2.5 2.2
Ending balance (158.4) (134.1) (158.4) (134.1)
Cash Flow Hedges [Member]        
Other comprehensive loss [Abstract]        
Beginning balance 0.0 (0.3) (1.0) 0.5
Other comprehensive income (loss) before reclassifications 0.3 (0.6) 1.1 (1.6)
Reclassifications for amortization of unrecognized net loss [1] 0.0 0.0 0.0 0.0
Reclassifications for realized losses - net [2] 0.3 0.3 0.8 0.2
Foreign currency translation gains   0.0 [3]   0.0
Income taxes (0.2) 0.1 (0.5) 0.4
Total other comprehensive income (loss) 0.4 (0.2) 1.4 (1.0)
Ending balance $ 0.4 $ (0.5) $ 0.4 $ (0.5)
[1] Amounts are included in the calculation of net periodic benefit cost for the Company’s defined benefit plans, which include pension and other postretirement plans. Refer to Note 4 for additional information about the Company’s pension plans.
[2] Amounts represent net gains and losses associated with cash flow hedges that were reclassified to net earnings.
[3] As a result of the sale of its investment in NEX during the second quarter of fiscal 2020, the Company wrote off $0.6 million of accumulated foreign currency translation gains.