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Other Financial Statements Details | 9 Months Ended
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Dec. 31, 2018
Accounts Receivable, Net [Abstract] |
Other Financial Statements Details | Other Financial Statement Details 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 |
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 |
Inventories are valued at the lower of cost and net realizable value using the first-in, first-out method. Inventory impairment charges establish a new cost basis for inventory and charges are not subsequently reversed to income even if circumstances later suggest that increased carrying amounts are recoverable. 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 |
Depreciation expense attributed to property, plant and equipment was $47.0 million and $132.2 million for the three and nine months ended December 31, 2018, respectively, compared to $32.0 million and $90.9 million for the three and nine months ended December 31, 2017, respectively.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 6: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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