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Other Financial Statements Details (Tables) | 9 Months Ended
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Dec. 31, 2018
Accounts Receivable, Net [Abstract] |
Schedule of accounts receivable | Accounts receivable consists of the following (in millions):
| December 31, 2018 |  | March 31, 2018
Trade accounts receivable | $ | 539.3 |  |  | $ | 557.8 |
Other | 7.5 |  |  | 8.1 |
Total accounts receivable, gross | 546.8 |  |  | 565.9 |
Less allowance for doubtful accounts | 2.0 |  |  | 2.2 |
Total accounts receivable, net | $ | 544.8 |  |  | $ | 563.7 |
Schedule of components of inventories | The components of inventories consist of the following (in millions):
| December 31, 2018 |  | March 31, 2018 |
Raw materials | $ | 81.4 |  |  | $ | 26.0 |
Work in process | 392.8 |  |  | 311.8 |
Finished goods | 228.3 |  |  | 138.4 |
Total inventories | $ | 702.5 |  |  | $ | 476.2 |
Schedule of property, plant and equipment | Property, plant and equipment consists of the following (in millions):
| December 31, 2018 |  | March 31, 2018
Land | $ | 82.3 |  |  | $ | 73.4 |
Building and building improvements | 634.3 |  |  | 508.5 |
Machinery and equipment | 2,197.1 |  |  | 1,943.9 |
Projects in process | 129.0 |  |  | 118.3 |
Total property, plant and equipment, gross | 3,042.7 |  |  | 2,644.1 |
Less accumulated depreciation and amortization | 2,003.0 |  |  | 1,876.2 |
Total property, plant and equipment, net | $ | 1,039.7 |  |  | $ | 767.9 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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