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Summary of Significant Accounting Policies - Immaterial Change in Statement of Cash Flows Line Items (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 451.2	$ 304.0	$ 308.5
Purchases of property, plant and equipment	(193.8)	(317.5)	(210.2)
Net cash used in investing activities	$ (203.8)	(864.4)	(245.5)
As reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable and accrued liabilities		(12.9)	14.2
Net cash provided by operating activities		287.6	302.0
Purchases of property, plant and equipment		(301.1)	(203.7)
Net cash used in investing activities		(848.0)	(239.0)
As adjusted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable and accrued liabilities		3.5	20.7
Net cash provided by operating activities		304.0	308.5
Purchases of property, plant and equipment		(317.5)	(210.2)
Net cash used in investing activities		$ (864.4)	$ (245.5)

X

- Definition

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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