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General (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | ---
ASSETS [Abstract] |  |
Inventories | $ 203.7 | $ 191.3
Other current assets | 68.6 | 70.1
Deferred income taxes | 94.9 | 96.9
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] |  |
Deferred income taxes | 9.1 | 9.9
Retained earnings | $ 409.3 | 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
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)

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