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Other Financial Statements Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,009.9		$ 3,009.9		$ 2,644.1
Less accumulated depreciation and amortization	1,958.0		1,958.0		1,876.2
Total property, plant and equipment, net	1,051.9		1,051.9		767.9
Depreciation	47.2	$ 29.9	85.2	$ 58.9
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	82.3		82.3		73.4
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	623.1		623.1		508.5
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,176.9		2,176.9		1,943.9
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 127.6		$ 127.6		$ 118.3

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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