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Description of Business, Basis of Presentation and Significant Accounting Policies (Other) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Apr. 01, 2018 USD ($) | Apr. 01, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative effect of accounting changes (less than $25 million for Topic 606) |  |  |  |  | $ 60.8
Income tax benefit | $ (319.4) | $ (148.9) | $ (76.5) |  |
Number of reporting units with goodwill | segment | 3 |  |  |  |
Advertising expenses | $ 654.9 | $ 588.8 | $ 470.2 |  |
Retained Earnings |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative effect of accounting changes (less than $25 million for Topic 606) |  |  |  |  | 60.8
Retained Earnings | Employee Share-Based Payment Accounting |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative effect of accounting changes (less than $25 million for Topic 606) |  |  |  |  | 54.3
Retained Earnings | Intra-Entity Transfers of Assets Other Than Inventory |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative effect of accounting changes (less than $25 million for Topic 606) |  |  |  |  | $ 6.5
Pro Forma | Intra-Entity Transfers of Assets Other Than Inventory |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income tax benefit | $ 3.0 |  |  |  |
Pro Forma | Revenue from Contracts with Customers (Topic 606) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative effect of accounting changes (less than $25 million for Topic 606) |  |  |  | $ 25.0 |
Subsequent Event | Retained Earnings | Recognition and Measurement of Financial Instruments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative effect of accounting changes (less than $25 million for Topic 606) |  |  |  | $ 3.2 |

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