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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%

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- 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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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 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References No definition available. + Details
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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 No definition available. + Details
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