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Recently Issued Accounting Pronouncements - Topic 606 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2018 | Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Net sales |  | $ 1,374.7 | $ 994.2 | $ 4,019.7 | $ 2,978.5 |  |
Cost of Sales | [1] | 595.1 | 387.1 | 1,908.8 | 1,172.9 |  |
Gross Profit |  | 779.6 | 607.1 | 2,110.9 | 1,805.6 |  |
Income tax (benefit) provision |  | 5.8 | 447.8 | (127.9) | 440.4 |  |
Net income |  | 49.2 | $ (251.1) | 181.2 | $ 108.7 |  |
Accounts receivable, net |  | 544.8 |  | 544.8 |  | $ 518.1 | $ 563.7
Inventories |  | 702.5 |  | 702.5 |  | 471.1 | 476.2
Other current assets |  | 194.1 |  | 194.1 |  | 137.0 | 119.8
Other assets |  | 106.4 |  | 106.4 |  | 47.7 | 71.8
Long-term deferred tax assets |  | 1,717.1 |  | 1,717.1 |  | 1,656.5 | 100.2
Accrued liabilities |  | 407.7 |  | 407.7 |  | 248.1 | 229.6
Deferred income on shipments to distributors |  | 0.0 |  | 0.0 |  | 0.0 | 333.8
Long-term deferred tax liability |  | 830.5 |  | 830.5 |  | 221.5 | 205.8
Retained earnings |  | 3,122.4 |  | 3,122.4 |  | $ 3,199.0 | 1,397.3
Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  | (45.6)
Inventories |  |  |  |  |  |  | (5.1)
Other current assets |  |  |  |  |  |  | 17.2
Other assets |  |  |  |  |  |  | 0.0
Long-term deferred tax assets |  |  |  |  |  |  | (23.1)
Accrued liabilities |  |  |  |  |  |  | 18.5
Deferred income on shipments to distributors |  |  |  |  |  |  | (333.8)
Long-term deferred tax liability |  |  |  |  |  |  | 16.8
Retained earnings |  |  |  |  |  |  | $ 241.9
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Net sales |  | 1,391.4 |  | 4,039.0 |  |  |
Cost of Sales |  | 606.6 |  | 1,925.9 |  |  |
Gross Profit |  | 784.8 |  | 2,113.1 |  |  |
Income tax (benefit) provision |  | 5.2 |  | (128.1) |  |  |
Net income |  | 55.0 |  | 183.6 |  |  |
Accounts receivable, net |  | 578.6 |  | 578.6 |  |  |
Inventories |  | 715.0 |  | 715.0 |  |  |
Other current assets |  | 157.3 |  | 157.3 |  |  |
Other assets |  | 100.9 |  | 100.9 |  |  |
Long-term deferred tax assets |  | 1,739.4 |  | 1,739.4 |  |  |
Accrued liabilities |  | 387.4 |  | 387.4 |  |  |
Deferred income on shipments to distributors |  | 320.1 |  | 320.1 |  |  |
Long-term deferred tax liability |  | 813.7 |  | 813.7 |  |  |
Retained earnings |  | 2,865.7 |  | 2,865.7 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Net sales |  | (16.7) |  | (19.3) |  |  |
Cost of Sales |  | (11.5) |  | (17.1) |  |  |
Gross Profit |  | (5.2) |  | (2.2) |  |  |
Income tax (benefit) provision |  | 0.6 |  | 0.2 |  |  |
Net income |  | (5.8) |  | (2.4) |  |  |
Accounts receivable, net |  | (33.8) |  | (33.8) |  |  |
Inventories |  | (12.5) |  | (12.5) |  |  |
Other current assets |  | 36.8 |  | 36.8 |  |  |
Other assets |  | 5.5 |  | 5.5 |  |  |
Long-term deferred tax assets |  | (22.3) |  | (22.3) |  |  |
Accrued liabilities |  | 20.3 |  | 20.3 |  |  |
Deferred income on shipments to distributors |  | (320.1) |  | (320.1) |  |  |
Long-term deferred tax liability |  | 16.8 |  | 16.8 |  |  |
Retained earnings |  | $ 256.7 |  | $ 256.7 |  |  |
[1] | Includes share-based compensation expense as follows: Cost of sales$3.4 $3.5 $10.9 $10.6Research and development$19.4 $10.9 $53.2 $31.8Selling, general and administrative$16.6 $9.6 $46.1 $27.6Special (income) charges and other, net$0.2 $— $17.3 $—

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