Revenue Recognition, Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
ASSETS [Abstract]
Inventories	$ 200.7	$ 191.3
Other current assets	65.8	70.1
Deferred income taxes	97.1	96.9
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Deferred income taxes	8.2	9.9
Retained earnings	472.1	394.9
ASU 2014-09 [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
Impact of New Accounting Guidance [Member] \| ASU 2014-09 [Member]
ASSETS [Abstract]
Inventories	3.8
Other current assets	(7.4)
Deferred income taxes	0.6
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Deferred income taxes	(0.3)
Retained earnings	(2.7)	$ 0.7
Results Without Impact of New Accounting Guidance [Member] \| ASU 2014-09 [Member]
ASSETS [Abstract]
Inventories	204.5
Other current assets	58.4
Deferred income taxes	97.7
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Deferred income taxes	7.9
Retained earnings	$ 469.4

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