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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Mar. 31, 2016
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Income Taxes [Line Items] |  |
Loss and credit carryforwards from share-based compensation not included in deferred tax assets | $ 153.2 |
Unrecognized tax benefits that if realized would impact effective tax rate | 0.6 | $ 0.6
Foreign Tax Authority | United Kingdom |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 0.7 |
Foreign Tax Authority | Canada |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 3.5 |
State and Local Jurisdiction |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 395.7 |
Domestic Tax Authority | United States |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 709.9 |
Credit carryforward | 57.5 |
Maximum |  |
Income Taxes [Line Items] |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 14.2 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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