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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	Sep. 30, 2017	Mar. 31, 2017
Assets:
Forward exchange contracts	$ 2.2	$ 0.6
Liabilities:
Forward exchange contracts	(2.3)	(0.5)
Level 1
Assets:
Forward exchange contracts	0.0	0.0
Liabilities:
Forward exchange contracts	0.0	0.0
Level 2
Assets:
Forward exchange contracts	2.2	0.6
Liabilities:
Forward exchange contracts	(2.3)	(0.5)
Next Games
Assets:
Available-for-sale securities	12.8	8.0
Next Games | Level 1
Assets:
Available-for-sale securities	12.8	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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 35
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-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

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