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Fair Value Measurements (Assets and Liabilities Required to Be Carried at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Assets:
Forward exchange contracts	$ 0.3	$ 0.6
Liabilities:
Forward exchange contracts	(0.6)	(0.5)
Total	7.0	8.1
Level 1
Assets:
Forward exchange contracts	0.0	0.0
Liabilities:
Forward exchange contracts	0.0	0.0
Total	7.3	8.0
Level 2
Assets:
Forward exchange contracts	0.3	0.6
Liabilities:
Forward exchange contracts	(0.6)	(0.5)
Total	(0.3)	0.1
Next Games
Assets:
Available-for-sale securities	7.3	8.0
Next Games | Level 1
Assets:
Available-for-sale securities	7.3	8.0
Next Games | Level 2
Assets:
Available-for-sale securities	$ 0.0	$ 0.0

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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