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Debt and Credit Facility (Tables) | 3 Months Ended
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Jun. 30, 2018
Convertible Debt [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | Debt obligations included in the condensed consolidated balance sheets consisted of the following (in millions):
|  | Coupon Interest Rate |  | Effective Interest Rate |  | Fair Value of Liability Component at Issuance (1) |  |
|  |  |  |  | June 30, 2018 |  | March 31, 2018
Senior Secured Indebtedness |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  | $ | 3,334.0 |  |  | $ | — |
Term Loan Facility |  |  |  |  |  |  |  | 3,000.0 |  |  | — |
2023 Notes, maturing June 1, 2023 ("2023 Notes") |  | 4.333% |  |  |  |  |  | 1,000.0 |  |  | — |
2021 Notes, maturing June 1, 2021 ("2021 Notes") |  | 3.922% |  |  |  |  |  | 1,000.0 |  |  | — |
Total Senior Secured Indebtedness |  |  |  |  |  |  |  | 8,334.0 |  |  | — |
Senior Subordinated Convertible Debt - Principal Outstanding |  |  |  |  |  |
2017 Senior Debt, maturing February 15, 2027 (2017 Senior Convertible Debt) |  | 1.625% |  | 6.0% |  | $1,396.3 |  | $ | 2,070.0 |  |  | $ | 2,070.0 |
2015 Senior Debt, maturing February 15, 2025 (2015 Senior Convertible Debt) |  | 1.625% |  | 5.9% |  | $1,160.1 |  | 1,725.0 |  |  | 1,725.0 |
Junior Subordinated Convertible Debt - Principal Outstanding |  |  |  |  |  |
2017 Junior Debt, maturing February 15, 2037 (2017 Junior Convertible Debt) |  | 2.250% |  | 7.4% |  | $321.1 |  | 686.3 |  |  | 686.3 |
Total Convertible Debt |  |  |  |  |  |  |  | 4,481.3 |  |  | 4,481.3 |
Gross long-term debt including current maturities |  |  |  |  |  |  |  | 12,815.3 |  |  | 4,481.3 |
Less: Debt discount (2) |  |  |  |  |  |  |  | (1,355.7 | ) |  | (1,372.9 | )
Less: Debt issuance costs (3) |  |  |  |  |  |  |  | (110.0 | ) |  | (40.1 | )
Net long-term debt including current maturities |  |  |  |  |  |  |  | 11,349.6 |  |  | 3,068.3 |
Less: Current maturities (4) |  |  |  |  |  |  |  | (1,329.8 | ) |  | (1,309.9 | )
Net long-term debt |  |  |  |  |  |  |  | $ | 10,019.8 |  |  | $ | 1,758.4 |
(1) As each of the convertible instruments may be settled in cash upon conversion, for accounting purposes, they were bifurcated into a liability component and an equity component, which are both initially recorded at fair value. The amount allocated to the equity component is the difference between the principal value of the instrument and the fair value of the liability component at issuance. The resulting debt discount is being amortized to interest expense at the respective effective interest rate over the contractual term of the debt. (2) The unamortized discount includes the following (in millions):
| June 30, |  | March 31,
| 2018 |  | 2018
2023 Notes | $ | (5.2 | ) |  | $ | — |
2021 Notes | (5.1 | ) |  | — |
2017 Senior Convertible Debt | (602.9 | ) |  | (616.3 | )
2015 Senior Convertible Debt | (388.4 | ) |  | (400.3 | )
2017 Junior Convertible Debt | (354.1 | ) |  | (356.3 | )
Total unamortized discount | $ | (1,355.7 | ) |  | $ | (1,372.9 | )
(3) Debt issuance costs include the following (in millions):
| June 30, |  | March 31,
| 2018 |  | 2018
Senior Credit Facility | $ | (18.6 | ) |  | $ | (5.9 | )
Term Loan Facility | (34.2 | ) |  | — |
2023 Notes | (12.0 | ) |  | — |
2021 Notes | (11.8 | ) |  | — |
2017 Senior Convertible Debt | (15.8 | ) |  | (16.1 | )
2015 Senior Convertible Debt | (14.3 | ) |  | (14.8 | )
2017 Junior Convertible Debt | (3.3 | ) |  | (3.3 | )
Total debt issuance costs | $ | (110.0 | ) |  | $ | (40.1 | )
(4) Current maturities include the full balance of the 2015 Senior Convertible Debt.
Schedule of Unamortized Discount and Debt Issuance Costs | (2) The unamortized discount includes the following (in millions):
| June 30, |  | March 31,
| 2018 |  | 2018
2023 Notes | $ | (5.2 | ) |  | $ | — |
2021 Notes | (5.1 | ) |  | — |
2017 Senior Convertible Debt | (602.9 | ) |  | (616.3 | )
2015 Senior Convertible Debt | (388.4 | ) |  | (400.3 | )
2017 Junior Convertible Debt | (354.1 | ) |  | (356.3 | )
Total unamortized discount | $ | (1,355.7 | ) |  | $ | (1,372.9 | )
(3) Debt issuance costs include the following (in millions):
| June 30, |  | March 31,
| 2018 |  | 2018
Senior Credit Facility | $ | (18.6 | ) |  | $ | (5.9 | )
Term Loan Facility | (34.2 | ) |  | — |
2023 Notes | (12.0 | ) |  | — |
2021 Notes | (11.8 | ) |  | — |
2017 Senior Convertible Debt | (15.8 | ) |  | (16.1 | )
2015 Senior Convertible Debt | (14.3 | ) |  | (14.8 | )
2017 Junior Convertible Debt | (3.3 | ) |  | (3.3 | )
Total debt issuance costs | $ | (110.0 | ) |  | $ | (40.1 | )
(4) Current maturities include the full balance of the 2015 Senior Convertible Debt
Schedule of Maturities of Long-term Debt | Expected maturities relating to the Company’s long-term debt (including current maturities) as of June 30, 2018 are as follows (in millions):
Fiscal year ending March 31, |  | Expected Maturities
2019 |  | $ | 5.6 |
2020 |  | 7.5 |
2021 |  | 7.5 |
2022 |  | 1,007.5 |
2023 |  | 7.5 |
Thereafter |  | 11,779.7 |
Total |  | $ | 12,815.3 |
Schedule of Convertible Debt | The following table sets forth the applicable Conversion Rates adjusted for dividends declared since issuance of such series of Convertible Debt and the applicable Incremental Share Factors and Maximum Conversion Rates as adjusted for dividends paid since the applicable issuance date:
| Dividend adjusted rates as of June 30, 2018
| Conversion Rate, adjusted |  | Approximate Conversion Price, adjusted |  | Incremental Share Factor, adjusted |  | Maximum Conversion Rate, adjusted
2017 Senior Convertible Debt | 10.1557 |  |  | $ | 98.47 |  |  | 5.0779 |  |  | 14.4720 |
2015 Senior Convertible Debt | 15.8372 |  |  | $ | 63.14 |  |  | 7.9186 |  |  | 22.1720 |
2017 Junior Convertible Debt | 10.3371 |  |  | $ | 96.74 |  |  | 5.1686 |  |  | 14.4720 |
The following is the weighted average conversion price per share used in calculating the dilutive effect (See Note 13 for details on the convertible debt):
| June 30,
| 2018 |  | 2017
2007 Junior Convertible Debt (1) | $ | — |  |  | $ | 23.69 |
2015 Senior Convertible Debt | $ | 63.27 |  |  | $ | 64.35 |
2017 Senior Convertible Debt | $ | 98.67 |  |  | $ | 100.35 |
2017 Junior Convertible Debt | $ | 96.93 |  |  | $ | 98.59 |
(1) No longer outstanding as of December 31, 2017.
Schedule of Interest Expense | Interest expense related to long-term debt includes the following (in millions):
| Three Months Ended June 30,
| 2018 |  | 2017
Interest expense on convertible debt |  |  |
Debt issuance amortization | $ | 0.9 |  |  | $ | 0.9 |
Amortization of debt discount - non cash interest expense | 27.5 |  |  | 25.9 |
Coupon interest expense | 19.3 |  |  | 19.4 |
Total interest expense on convertible debt | 47.7 |  |  | 46.2 |
Interest expense on Term Loan Facility and Senior Secured Notes |  |  |
Debt issuance amortization | 1.3 |  |  | — |
Interest expense | 18.3 |  |  | — |
Total interest expense on Term Loan Facility and Senior Secured Notes | 19.6 |  |  | — |
Total interest expense on convertible debt, Term Loan Facility, and Senior Secured Notes | $ | 67.3 |  |  | $ | 46.2 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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