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Debt (Narrative - Debt Transactions) (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 22, 2018	Dec. 11, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Feb. 04, 2019	Apr. 15, 2018
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 1,500.0		$ 1,500.0
Debt instrument, term	5 years
Term Loan | Previous Term Loan A
Debt Instrument [Line Items]
Principal amount of debt prepaid	$ 950.0
Term Loan | Previous Term Loan B
Debt Instrument [Line Items]
Principal amount of debt prepaid	825.0	$ 25.0			$ 740.0
Term Loan | Term Loan A
Debt Instrument [Line Items]
Principal amount of notes	$ 750.0
Debt instrument, term	5 years
Term Loan | Term Loan B
Debt Instrument [Line Items]
Cash paid for repurchases of debt			22.0
Debt instrument, principal amount repurchased			28.0
Principal amount of notes	$ 1,250.0
Principal amount of debt prepaid			101.9	$ 130.0
Debt instrument, term	7 years
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Cash paid for repurchases of debt			1.0
Debt instrument, principal amount repurchased			$ 1.3
Coupon rate			5.875%
Senior Notes | 6.375% Senior Notes
Debt Instrument [Line Items]
Cash paid for repurchases of debt			$ 3.5
Debt instrument, principal amount repurchased			$ 4.4
Principal amount of notes						$ 550.0
Coupon rate			6.375%
Convertible Senior Subordinated Notes | April 2013 Notes
Debt Instrument [Line Items]
Coupon rate							1.25%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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
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- Definition

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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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Gross amount of debt extinguished.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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