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Debt and Credit Facility | 12 Months Ended
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Mar. 31, 2018
Convertible Debt [Abstract] |
Debt and Credit Facility | Debt and Credit Facility Debt obligations included in the consolidated balance sheets consisted of the following (in millions):
|  | Coupon Interest Rate |  | Effective Interest Rate |  | Fair Value of Liability Component at Issuance (1) |  | March 31,
|  |  |  |  | 2018 |  | 2017
Senior Indebtedness |  |  |  |  |  |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  | $ | — |  |  | $ | — |
Senior Subordinated Convertible Debt - Principal Outstanding |  |  |  |  |  |  |  |  |  |
2017 Senior Debt, maturing February 15, 2027 (2017 Senior Debt) |  | 1.625% |  | 6.0% |  | $1,396.3 |  | $ | 2,070.0 |  |  | $ | 2,070.0 |
2015 Senior Debt, maturing February 15, 2025 (2015 Senior 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 Debt) |  | 2.250% |  | 7.4% |  | 321.1 |  | 686.3 |  |  | 575.0 |
2007 Junior Debt, maturing December 15, 2037 (2007 Junior Debt) |  | 2.125% |  | 9.1% |  | — |  | — |  |  | 143.8 |
Total Convertible Debt |  |  |  |  |  |  |  | 4,481.3 |  |  | 4,513.8 |
Gross long-term debt including current maturities |  |  |  |  |  |  |  | 4,481.3 |  |  | 4,513.8 |
Less: Debt discount (2) |  |  |  |  |  |  |  | (1,372.9 | ) |  | (1,516.5 | )
Less: Debt issuance costs (3) |  |  |  |  |  |  |  | (40.1 | ) |  | (46.8 | )
Net long-term debt including current maturities |  |  |  |  |  |  |  | 3,068.3 |  |  | 2,950.5 |
Less: Current maturities (4) |  |  |  |  |  |  |  | (1,309.9 | ) |  | (50.0 | )
Net long-term debt |  |  |  |  |  |  |  | $ | 1,758.4 |  |  | $ | 2,900.5 |
(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):
| March 31,
| 2018 |  | 2017
2017 Senior Debt | $ | (616.3 | ) |  | $ | (667.5 | )
2015 Senior Debt | (400.3 | ) |  | (446.6 | )
2017 Junior Debt | (356.3 | ) |  | (309.3 | )
2007 Junior Debt | — |  |  | (93.1 | )
Total unamortized discount | $ | (1,372.9 | ) |  | $ | (1,516.5 | )
(3) Debt issuance costs include the following (in millions):
| March 31,
| 2018 |  | 2017
Senior Credit Facility | $ | (5.9 | ) |  | $ | (8.5 | )
2017 Senior Debt | (16.1 | ) |  | (17.6 | )
2015 Senior Debt | (14.8 | ) |  | (16.6 | )
2017 Junior Debt | (3.3 | ) |  | (3.4 | )
2007 Junior Debt | — |  |  | (0.7 | )
Total debt issuance costs | $ | (40.1 | ) |  | $ | (46.8 | )
(4) Current maturities include the full balance of the 2015 Senior Debt as of March 31, 2018 and the full balance of the 2007 Junior Debt as of March 31, 2017. Ranking of Indebtedness - The Senior Subordinated Convertible Debt and Junior Subordinated Convertible Debt (collectively, the Convertible Debt) are unsecured obligations which are subordinated in right of payment to the amounts outstanding under the Company's Credit Facility. The Junior Subordinated Convertible Debt is expressly subordinated in right of payment to any existing and future senior debt of the Company (including the Credit Facility and the Senior Subordinated Convertible Debt) and is structurally subordinated in right of payment to the liabilities of the Company's subsidiaries. The Senior Subordinated Convertible Debt is subordinated to the Credit Facility; ranks senior to the Company's indebtedness that is expressly subordinated in right of payment, including the Junior Subordinated Convertible Debt; ranks equal in right of payment to any of the Company's unsubordinated indebtedness that does not provide that it is senior to the Senior Subordinated Convertible Debt; ranks junior in right of payment to any of the Company's secured, unsubordinated indebtedness to the extent of the value of the assets securing such indebtedness; and ranks junior to all indebtedness and other liabilities of the Company's subsidiaries. Summary of Conversion Features - Each series of Convertible Debt is convertible, subject to certain conditions, into cash, shares of the Company's common stock or a combination thereof, at the Company's election, at specified Conversion Rates (see table below), adjusted for certain events including the declaration of cash dividends. Until the three-months immediately preceding the maturity date of the applicable series of Convertible Debt, each series of Convertible Debt is convertible only upon the occurrence of (1) such time as the closing price of the Company's common stock exceeds the Conversion Price (see table below) by 130% for 20 days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter or (2) during the 5 business day period after any 10 consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day or (3) upon the occurrence of certain corporate events specified in the indenture of such series of Convertible Debt. In addition, for each series, if at the time of conversion the applicable price of the Company's common stock exceeds the applicable Conversion Price at such time, the applicable Conversion Rate will be increased by up to an additional maximum incremental shares rate, as determined pursuant to a formula specified in the indenture for the applicable series of Convertible Debt, and as adjusted for cash dividends paid since the issuance of such series of Convertible Debt. However, in no event will the applicable Conversion Rate exceed the applicable Maximum Conversion Rate specified in the indenture for the applicable series of Convertible Debt (see table below). 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 March 31, 2018
| Conversion Rate, adjusted |  | Approximate Conversion Price, adjusted |  | Incremental Share Factor, adjusted |  | Maximum Conversion Rate, adjusted
2017 Senior Debt | 10.1162 |  |  | $ | 98.85 |  |  | 5.0581 |  |  | 14.4156 |
2015 Senior Debt | 15.7755 |  |  | $ | 63.39 |  |  | 7.8878 |  |  | 22.0857 |
2017 Junior Debt | 10.2969 |  |  | $ | 97.12 |  |  | 5.1485 |  |  | 14.4156 |
As of March 31, 2018, the holders of the 2015 Senior Debt have the right to convert their debentures between April 1, 2018 and June 30, 2018 because the Company's common stock price has exceeded the Conversion Price by 130% for the specified period of time during the quarter ended March 31, 2018. As of March 31, 2018, the 2015 Senior Debt had a value if converted above par of $1,141.7 million. The 2015 Senior Debt is included in the current portion of long-term debt. The Company may not redeem any series of Convertible Debt prior to the relevant maturity date and no sinking fund is provided for any series of Convertible Debt. Upon the occurrence of a fundamental change as defined in the applicable indenture of such series of Convertible Debt, holders of such series may require the Company to purchase all or a portion of their Convertible Debt for cash at a price equal to 100% of the principal amount plus any accrued and unpaid interest. Interest expense related to convertible debt includes the following (in millions):
| Year Ended March 31,
| 2018 |  | 2017 |  | 2016
Debt issuance amortization | $ | 3.5 |  |  | $ | 2.1 |  |  | $ | 1.8 |
Amortization of debt discount - non cash interest expense | 106.1 |  |  | 56.1 |  |  | 48.0 |
Coupon interest expense | 77.3 |  |  | 44.5 |  |  | 40.2 |
Total | $ | 186.9 |  |  | $ | 102.7 |  |  | $ | 90.0 |
The remaining period over which the unamortized debt discount will be recognized as non-cash interest expense is 8.88 years, 6.88 years, and 18.88 years for the 2017 Senior Debt, 2015 Senior Debt and 2017 Junior Debt, respectively. Issuances and Settlements In November 2017, the Company called $14.6 million in principal value of the remaining outstanding 2007 Junior Debt with an effective date of December 15, 2017 for which substantially all holders submitted requests to convert. Prior to the call, conversion requests were received in both the second and third quarters of fiscal 2018. Total conversions for fiscal 2018 were for a principal amount of $32.5 million for which the Company settled the principal amount in cash and issued 0.5 million shares of its common stock in respect of the conversion value in excess of the principal amount for the conversions occurring prior to the call notice and $41.0 million in cash for the conversion value in excess of the principal amount for the conversion requests received after the call notice. A loss on total conversions was recorded for $2.2 million. The 2007 Junior Debt was classified as a current liability on the consolidated balance sheet as of March 31, 2017. In June 2017, the Company exchanged in privately negotiated transactions $111.3 million aggregate principal amount of its 2007 Junior Debt for (i) $111.3 million principal amount of 2017 Junior Debt with a market value of $119.3 million plus (ii) the issuance of 3.2 million shares of the Company's common stock with a value of $254.6 million, of which $56.3 million was allocated to the fair value of the liability and $321.1 million was allocated to the reacquisition of the equity component for total consideration of $374.0 million. The transaction resulted in a loss on settlement of the 2007 Junior Debt of approximately $13.8 million, which represented the difference between the fair value of the liability component at time of repurchase and the sum of the carrying values of the debt component and any unamortized debt issuance costs. The debt discount on the new 2017 Junior Debt was the difference between the par value and the fair value of the debt resulting in a debt discount of $55.1 million which will be amortized to interest expense using the effective interest method over the term of the debt. In February 2017, the Company issued the 2017 Senior Debt and 2017 Junior Debt for net proceeds of $2,043.6 million and $567.7 million, respectively. In connection with the issuance of these instruments, the Company incurred issuance costs of $33.7 million, of which $17.8 million and $3.4 million was recorded as debt issuance costs related to the 2017 Senior Debt and 2017 Junior Debt, respectively, and will be amortized using the effective interest method over the term of the debt. The balance of $12.5 million in fees was recorded to equity. Interest on both instruments is payable semi-annually on February 15 and August 15 of each year. In February 2015, the Company issued the 2015 Senior Debt for net proceeds of approximately $1,694.7 million. In connection with the issuance, the Company incurred issuance costs of $30.3 million, of which $20.4 million was recorded as debt issuance costs and will be amortized using the effective interest method over the term of the debt. The balance of $9.9 million was recorded to equity. The Company utilized the proceeds from the issuances of the 2017 Senior Debt, 2017 Junior Debt, and 2015 Senior Debt to reduce amounts borrowed under its Credit Facility and to settle a portion of the 2007 Junior Debt in privately negotiated transactions. In February 2017 and February 2015, the Company settled $431.3 million and $575.0 million, respectively, in aggregate principal of its 2007 Junior Debt. The 2015 repurchase consisted solely of cash. In February 2017 , the Company used cash of $431.3 million and an aggregate of 12.0 million in shares of the Company's common stock valued at $862.7 million for total consideration of $1,293.9 million to settle $431.3 million of the 2007 Junior Debt, of which $188.0 million was allocated to the liability component and $1,105.9 million was allocated to the equity component. In addition, in February 2017, there was an inducement fee of $5.0 million which was recorded in the consolidated statements of income in loss on settlement of convertible debt. The consideration transferred in February 2015 was $1,134.6 million, of which $238.3 million was allocated to the liability component and $896.3 million was allocated to the equity component. In the case of both settlements of the 2007 Junior Debt, the consideration was allocated to the liability and equity components using the equivalent rate that reflected the borrowing rate for a similar non-convertible debt prior to the retirement. The transactions resulted in a loss on settlement of convertible debt of approximately $43.9 million and $50.6 million in fiscal 2017 and fiscal 2015, respectively, which represented, in each case, the difference between the fair value of the liability component at time of repurchase and the sum of the carrying values of the debt component and any unamortized debt issuance costs. Credit Facility The Company maintains a credit facility which is available until February 4, 2020 (the "Credit Agreement") which was amended subsequent to the end of fiscal 2018. See Note 23 for more details on subsequent events. At the beginning of the second quarter of fiscal 2018, the credit facility had a borrowing capacity of $2.774 billion comprised of two tranches; one tranche terminating in 2018 (the "2018 Tranche") and one tranche terminating in 2020 (the "2020 Tranche"). During the second quarter of fiscal 2018, the Company terminated the 2018 Tranche and in connection with such termination increased the commitments for the 2020 Tranche in each of the three months ended September 30, 2017 and December 31, 2017. In November 2017, the Company entered into an augmenting lender supplement which added a new lender to the Credit Agreement with a 2020 multicurrency tranche commitment. As of March 31, 2018, the 2020 Tranche commitment under the credit facility was $3.122 billion. The financial covenants include, among others, limits on the Company's consolidated senior ratio and total leverage ratio. The maximum Total Leverage Ratio (capitalized terms not otherwise defined in this Form 10-K have the meaning of the defined terms in the applicable agreements) cannot exceed 5.00 to 1.00 and is calculated as Consolidated Total Indebtedness, excluding the Junior Debt up to a $700 million maximum, to Consolidated EBIDTA for a period of four quarters. The Total Leverage Ratio may be temporarily increased to 5.50 to 1.00 for a period of four consecutive quarters in conjunction with a Permitted Acquisition occurring during the first four quarters following the acquisition. The Total Leverage Ratio then decreases to 5.25 to 1.00 for three consecutive quarters, finally returning to the stated 5.00 to 1.00 Total Leverage Ratio after a period of seven consecutive fiscal periods. The Company can elect to use this special feature, also referred to as an Adjusted Covenant Period, not more than one time from and after February 8, 2017, the effective date of the February 2017 amendment (discussed below), and may elect to terminate an Adjusted Covenant Period prior to the end of the Adjusted Covenant Period. The Credit Facility also requires that the Senior Leverage Ratio not exceed 3.50 to 1.00, which is calculated as Consolidated Senior Indebtedness to Consolidated EBIDTA for four consecutive quarters. The Company is also required to comply with an Interest Coverage Ratio of at least 3.50 to 1.00, measured quarterly. In June 2017, in connection with the settlement of the 2007 Junior Debt, the Company amended the Credit Agreement to (i) extend the time period during which the Company is permitted to repurchase, redeem or exchange the 2007 Junior Debt and (ii) amend the maximum total leverage ratio covenant to extend the time period for permitted refinancings or exchanges of the 2007 Junior Debt that may be excluded from the calculation of the ratio, subject to certain conditions. The Credit Agreement has a $125 million foreign currency sublimit, a $25 million letter of credit sublimit and a $25 million swingline loan sublimit. The Company has the option to obtain additional tranche commitments or additional indebtedness as long as, on a proforma basis, the Senior Leverage Ratio is equal to or less than 2.50 to 1.00. In February 2017, the Company used $1,682.5 million of the proceeds from the issuance of the 2017 Senior Debt and 2017 Junior Debt to pay off the entire balance under the revolving credit facility. In connection with the February 2017 amendment to the Credit Agreement, the Company incurred $2.1 million of issuance fees which will be amortized over the term of the facility and for which the balance is recorded net of any outstanding Credit Facility balance. At March 31, 2018 and 2017, there were no outstanding borrowings under the revolving credit facility and no letters of credit outstanding under the Credit Agreement. The Company's obligations under the Credit Agreement are guaranteed by certain of its subsidiaries meeting materiality thresholds set forth in the Credit Agreement. To secure the Company's obligations under the Credit Agreement, the Company and its domestic subsidiaries are required to pledge the equity securities of certain of their respective material subsidiaries, subject to certain exceptions and limitations. In addition, in connection with the February 2017 amendment, the Company and the guarantor subsidiaries granted a security interest in substantially all of their personal property to secure the obligations under the Credit Agreement. The loans under the Credit Agreement bear interest, at the Company's option, at the base rate plus a spread of 0.25% to 1.25% or an adjusted LIBOR rate (based on one, two, three, or six-month interest periods) plus a spread of 1.25% to 2.25%, in each case with such spread being determined based on the consolidated leverage ratio for the preceding four fiscal quarters (in the case of the 2018 tranche revolving loans) or the consolidated senior leverage ratio (in the case of the 2020 tranche revolving loans). The base rate means the highest of JPMorgan Chase Bank, N.A.'s prime rate, the federal funds rate plus a margin equal to 0.50% and the adjusted LIBOR rate for a 1-month interest period plus a margin equal to 1.00%. Swingline loans accrue interest at a per annum rate based on the base rate plus the applicable margin for base rate loans. Base rate loans may only be made in U.S. Dollars. The Company is also obligated to pay other customary administration fees and letter of credit fees for a credit facility of this size and type. Interest is due and payable in arrears quarterly for loans bearing interest at the base rate and at the end of an interest period (or at each three-month interval in the case of loans with interest periods greater than three months) in the case of loans bearing interest at the adjusted LIBOR rate. Interest expense related to the credit agreement was approximately $9.7 million in fiscal 2018, approximately $42.9 million in fiscal 2017 and approximately $18.9 million in fiscal 2016. Principal, together with all accrued and unpaid interest, is due and payable on the respective tranche maturity date, which is February 4, 2020 for the 2020 tranche revolving loans. The Company pays a quarterly commitment fee on the available but unused portion of its line of credit which is calculated on the average daily available balance during the period. The Company may prepay the loans and terminate the commitments, in whole or in part, at any time without premium or penalty, subject to certain conditions including minimum amounts in the case of commitment reductions and reimbursement of certain costs in the case of prepayments of LIBOR loans. The Credit Agreement contains customary affirmative and negative covenants, including covenants that limit or restrict the Company and its subsidiaries' ability to, among other things, incur subsidiary indebtedness, grant liens, merge or consolidate, dispose of assets, make investments, make acquisitions, enter into certain transactions with affiliates, pay dividends or make distributions, repurchase stock, enter into restrictive agreements and enter into sale and leaseback transactions, in each case subject to customary exceptions for a credit facility of this size and type. The Company is also required to maintain compliance with a senior leverage ratio, a total leverage ratio and an interest coverage ratio, all measured quarterly and calculated on a consolidated bases. At March 31, 2018, the Company was in compliance with these financial covenants. The Credit Agreement includes customary events of default that include, among other things, non-payment defaults, inaccuracy of representations and warranties, covenant defaults, cross default to material indebtedness, bankruptcy and insolvency defaults, material judgment defaults, ERISA defaults and a change of control default. The occurrence of an event of default could result in the acceleration of the obligations under the Credit Agreement. Under certain circumstances, a default interest rate will apply on all obligations during the existence of an event of default under the Credit Agreement at a per annum rate equal to 2.00% above the applicable interest rate for any overdue principal and 2.00% above the rate applicable for base rate loans for any other overdue amounts.

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