Goodwill and Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Intangible assets subject to amortization:
Weighted Average Useful Life	13 years	13 years
Accumulated Amortization	$ (607.9)	$ (574.2)
Intangible assets not subject to amortization - trademarks and tradenames
Gross Carrying Amount	1,122.1	1,085.7
Net Carrying Amount	$ 514.2	$ 511.5
Patents
Intangible assets subject to amortization:
Weighted Average Useful Life	10 years	10 years
Gross Carrying Amount	$ 51.1	$ 50.9
Accumulated Amortization	(41.2)	(39.8)
Net Carrying Amount	$ 9.9	$ 11.1
Customer relationships (including distribution network)
Intangible assets subject to amortization:
Weighted Average Useful Life	13 years	13 years
Gross Carrying Amount	$ 748.0	$ 713.5
Accumulated Amortization	(552.5)	(523.1)
Net Carrying Amount	$ 195.5	$ 190.4
Tradenames
Intangible assets subject to amortization:
Weighted Average Useful Life	13 years	13 years
Gross Carrying Amount	$ 42.1	$ 40.4
Accumulated Amortization	(14.2)	(11.3)
Net Carrying Amount	27.9	29.1
Intangible assets not subject to amortization - trademarks and tradenames
Intangible assets not subject to amortization - trademarks and tradenames	$ 280.9	$ 280.9