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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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