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Goodwill and Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Intangible assets subject to amortization:    
Weighted Average Useful Life 13 years 13 years
Accumulated Amortization $ (574.2) $ (541.7)
Intangible assets not subject to amortization - trademarks and tradenames    
Gross Carrying Amount 1,085.7 1,072.6
Net Carrying Amount $ 511.5 $ 530.9
Patents    
Intangible assets subject to amortization:    
Weighted Average Useful Life 10 years 10 years
Gross Carrying Amount $ 50.9 $ 51.3
Accumulated Amortization (39.8) (38.4)
Net Carrying Amount $ 11.1 $ 12.9
Customer relationships (including distribution network)    
Intangible assets subject to amortization:    
Weighted Average Useful Life 13 years 13 years
Gross Carrying Amount $ 713.5 $ 700.3
Accumulated Amortization (523.1) (494.8)
Net Carrying Amount $ 190.4 $ 205.5
Tradenames    
Intangible assets subject to amortization:    
Weighted Average Useful Life 13 years 13 years
Gross Carrying Amount $ 40.4 $ 40.1
Accumulated Amortization (11.3) (8.5)
Net Carrying Amount 29.1 31.6
Intangible assets not subject to amortization - trademarks and tradenames    
Intangible assets not subject to amortization - trademarks and tradenames $ 280.9 $ 280.9