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General (Recent Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Apr. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment for new accounting pronouncement |  |  |  |  | $ 60.8
Income tax provision | $ (47.6) | $ (53.6) | $ (0.8) | $ (79.9) |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment for new accounting pronouncement |  |  |  |  | 60.8
Retained Earnings | Employee Share-Based Payment Accounting |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment for new accounting pronouncement |  |  |  |  | 54.3
Retained Earnings | Intra-Entity Transfers of Assets Other Than Inventory |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment for new accounting pronouncement |  |  |  |  | $ 6.5
Pro Forma | Intra-Entity Transfers of Assets Other Than Inventory |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Income tax provision | $ 0.2 |  | $ 3.3 |  |

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