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General (Recent Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 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 | $ (204.2) | $ (12.2) | $ (205.0) | $ (92.2) |
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 |  | $ 3.5 |  |

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