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Significant Accounting Policies - Topic 606 (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 5,349.5 | $ 3,980.8 | $ 3,407.8 |
Cost of sales | [1] |  |  |  |  |  |  |  |  | 2,418.2 | 1,560.1 | 1,650.6 |
Gross profit |  | $ 820.5 | $ 779.6 | $ 689.3 | $ 642.0 | $ 615.1 | $ 607.1 | $ 614.1 | $ 584.4 | 2,931.3 | 2,420.7 | 1,757.2 |
Income before income taxes |  |  |  |  |  |  |  |  |  | 204.5 | 737.3 | 89.8 |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (151.4) | 481.9 | (80.8) |
Net income from continuing operations |  | 174.7 | $ 49.2 | $ 96.3 | $ 35.7 | 146.7 | $ (251.1) | $ 189.2 | $ 170.6 | 355.9 | 255.4 | $ 170.6 |
Accounts receivable, net |  | 880.6 |  |  |  | 563.7 |  |  |  | 880.6 | 563.7 |  | $ 903.8
Inventories |  | 711.7 |  |  |  | 476.2 |  |  |  | 711.7 | 476.2 |  | 471.1
Other current assets |  | 191.6 |  |  |  | 119.8 |  |  |  | 191.6 | 119.8 |  | 137.0
Other assets |  | 111.8 |  |  |  | 71.8 |  |  |  | 111.8 | 71.8 |  | 47.7
Long-term deferred tax assets |  | 1,677.2 |  |  |  | 100.2 |  |  |  | 1,677.2 | 100.2 |  | 1,656.5
Accrued liabilities |  | 787.3 |  |  |  | 229.6 |  |  |  | 787.3 | 229.6 |  | 633.8
Deferred income on shipments to distributors |  | 0.0 |  |  |  | 333.8 |  |  |  | 0.0 | 333.8 |  | 0.0
Long-term deferred tax liability |  | 706.1 |  |  |  | 205.8 |  |  |  | 706.1 | 205.8 |  | 221.5
Retained earnings |  | 3,210.6 |  |  |  | 1,397.3 |  |  |  | 3,210.6 | 1,397.3 |  | $ 3,199.0
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  | 340.1 |  |  |  |  | 340.1 |  |
Inventories |  |  |  |  |  | (5.1) |  |  |  |  | (5.1) |  |
Other current assets |  |  |  |  |  | 17.2 |  |  |  |  | 17.2 |  |
Other assets |  |  |  |  |  | 0.0 |  |  |  |  | 0.0 |  |
Long-term deferred tax assets |  |  |  |  |  | (23.1) |  |  |  |  | (23.1) |  |
Accrued liabilities |  |  |  |  |  | 404.2 |  |  |  |  | 404.2 |  |
Deferred income on shipments to distributors |  |  |  |  |  | (333.8) |  |  |  |  | (333.8) |  |
Long-term deferred tax liability |  |  |  |  |  | 16.8 |  |  |  |  | 16.8 |  |
Retained earnings |  |  |  |  |  | $ 241.9 |  |  |  |  | $ 241.9 |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 5,380.1 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 2,434.0 |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 2,946.1 |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 219.3 |  |  |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (149.0) |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  |  | 368.3 |  |  |
Accounts receivable, net |  | 556.1 |  |  |  |  |  |  |  | 556.1 |  |  |
Inventories |  | 724.2 |  |  |  |  |  |  |  | 724.2 |  |  |
Other current assets |  | 154.7 |  |  |  |  |  |  |  | 154.7 |  |  |
Other assets |  | 106.3 |  |  |  |  |  |  |  | 106.3 |  |  |
Long-term deferred tax assets |  | 1,700.7 |  |  |  |  |  |  |  | 1,700.7 |  |  |
Accrued liabilities |  | 420.3 |  |  |  |  |  |  |  | 420.3 |  |  |
Deferred income on shipments to distributors |  | 288.2 |  |  |  |  |  |  |  | 288.2 |  |  |
Long-term deferred tax liability |  | 689.3 |  |  |  |  |  |  |  | 689.3 |  |  |
Retained earnings |  | 2,975.3 |  |  |  |  |  |  |  | 2,975.3 |  |  |
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 |  |  |  |  |  |  |  |  |  | (30.6) |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | (15.8) |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | (14.8) |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | (14.8) |  |  |
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (2.4) |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  |  | (12.4) |  |  |
Accounts receivable, net |  | 324.5 |  |  |  |  |  |  |  | 324.5 |  |  |
Inventories |  | (12.5) |  |  |  |  |  |  |  | (12.5) |  |  |
Other current assets |  | 36.9 |  |  |  |  |  |  |  | 36.9 |  |  |
Other assets |  | 5.5 |  |  |  |  |  |  |  | 5.5 |  |  |
Long-term deferred tax assets |  | (23.5) |  |  |  |  |  |  |  | (23.5) |  |  |
Accrued liabilities |  | 367.0 |  |  |  |  |  |  |  | 367.0 |  |  |
Deferred income on shipments to distributors |  | (288.2) |  |  |  |  |  |  |  | (288.2) |  |  |
Long-term deferred tax liability |  | 16.8 |  |  |  |  |  |  |  | 16.8 |  |  |
Retained earnings |  | $ 235.3 |  |  |  |  |  |  |  | $ 235.3 |  |  |
[1] | (1) Includes share-based compensation expense as follows: Cost of sales$14.9 $13.8 $18.7Research and development$72.0 $42.5 $46.8Selling, general and administrative$62.3 $36.9 $62.6Special charges and other, net$17.2 $— $—

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