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General (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Apr. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment for new accounting pronouncement |  |  | $ 18.7 |  |
Decrease in cash provided by operating activities | $ 269.9 | $ 336.6 |  |  |
Increase in beginning cash and cash equivalents to include restricted cash |  |  |  | $ 378.1 | $ 324.7
Restricted cash | $ 0.0 |  |  | $ 0.0 |
Revenue Recognition ASU 2014-09 |  |  |  |  |
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 |  |  |
Increase in beginning cash and cash equivalents to include restricted cash |  |  |  |  | $ 2.8
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment for new accounting pronouncement |  |  | 21.3 |  |
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 |  |

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