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Description of Business, Basis of Presentation and Significant Accounting Policies (Other) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 01, 2018 | Apr. 01, 2017 | Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment for new accounting pronouncement |  |  |  |  | $ 18.7 | $ 60.8 |
Decrease in cash provided by operating activities |  | $ 427.5 | $ 386.4 | $ 558.5 |  |  |
Increase in beginning cash and cash equivalents to include restricted cash |  | 184.3 | 378.1 | 324.7 |  |  | $ 60.6
Restricted cash |  | 0.0 | 0.0 |  |  |  |
Advertising expenses |  | $ 640.1 | 654.9 | 588.8 |  |  |
Timing of payment |  | 60 days |  |  |  |  |
Revenue from Contracts with Customers (Topic 606) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment for new accounting pronouncement |  |  |  |  | 18.7 |  |
Liability for sales returns and certain sales incentive allowances |  |  |  |  | 86.9 |  |
Restricted Cash |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Decrease in cash provided by operating activities |  |  | $ 2.8 | 0.1 |  |  |
Increase in beginning cash and cash equivalents to include restricted cash |  |  |  | $ 2.8 |  |  | $ 2.9
Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment for new accounting pronouncement |  |  |  |  | 21.3 | $ 60.8 |
Retained Earnings | Recognition and Measurement of Financial Instruments |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment for new accounting pronouncement |  |  |  |  | $ 2.6 |  |
Minimum | Pro Forma | Accounting for Leases |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Quantification of new accounting pronouncements | $ 180.0 |  |  |  |  |  |
Maximum | Pro Forma | Accounting for Leases |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Quantification of new accounting pronouncements | $ 200.0 |  |  |  |  |  |

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