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Accounting Pronouncements (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment |  |  | $ 49.6
Increase to other current assets | $ 55.9 | $ 58.9 |
Decrease to inventories | (476.2) | (417.2) |
Decrease to deferred taxes | (105.6) | (340.2) |
Increase to retained earnings | 1,397.3 | $ 1,479.4 |
Accounting Standards Update 2016-09, Forfeiture Rate Component, Share-based Payment Award Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income tax assets, net |  |  | 2.3
Accounting Standards Update 2016-09, Excess Tax Benefit Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income tax assets, net |  |  | 47.2
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment |  |  | 47.6
Retained Earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment |  |  | 2.0
Retained Earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component, Share-based Payment Award Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment |  |  | 2.3
Retained Earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment |  |  | 47.2
Retained Earnings | Accounting Standards Update 2016-16 | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment | 1,600.0 |  |
Additional Paid-in Capital | Accounting Standards Update 2016-09, Forfeiture Rate Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of ASU 2016-09, cumulative adjustment |  |  | $ (2.0)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Elimination of deferred revenue | 334.0 |  |
Minimum | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease to accounts receivable | 41.0 |  |
Increase to accrued liabilities | 10.0 |  |
Increase to other current assets | 14.0 |  |
Decrease to inventories | 4.0 |  |
Decrease to deferred taxes | 38.0 |  |
Increase to retained earnings | 219.0 |  |
Maximum | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease to accounts receivable | 51.0 |  |
Increase to accrued liabilities | 14.0 |  |
Increase to other current assets | 18.0 |  |
Decrease to inventories | 6.0 |  |
Decrease to deferred taxes | 58.0 |  |
Increase to retained earnings | $ 259.0 |  |

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