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Debt Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017 | Feb. 28, 2017 | Feb. 28, 2015
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 4,481.3 | $ 4,513.8 |  |
Total Convertible Debt | 4,481.3 | 4,513.8 |  |
Amount of unamortized debt discount of debentures | (1,372.9) | (1,516.5) |  |
Debt issuance amortization | (40.1) | (46.8) | $ (33.7) |
Net long-term debt including current maturities | 3,068.3 | 2,950.5 |  |
Less: Current maturities | (1,309.9) | (50.0) |  |
Net long-term debt | 1,758.4 | 2,900.5 |  |
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility | 0.0 | 0.0 |  |
Debt issuance amortization | $ (5.9) | (8.5) |  |
2017 Senior Subordinated Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Coupon Interest Rate | 1.625% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.97% |  |  |
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date | $ 1,396.3 |  |  |
Long-term debt, gross | 2,070.0 | 2,070.0 |  |
Amount of unamortized debt discount of debentures | (616.3) | (667.5) |  |
Debt issuance amortization | $ (16.1) | (17.6) |  |
2015 Senior Subordinated Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Coupon Interest Rate | 1.625% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.90% |  |  |
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date | $ 1,160.1 |  |  |
Long-term debt, gross | 1,725.0 | 1,725.0 |  |
Amount of unamortized debt discount of debentures | (400.3) | (446.6) |  |
Debt issuance amortization | $ (14.8) | (16.6) |  | $ (30.3)
2017 Junior Subordinated Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Coupon Interest Rate | 2.25% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 7.37% |  |  |
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date | $ 321.1 |  |  |
Long-term debt, gross | 686.3 | 575.0 |  |
Amount of unamortized debt discount of debentures | (356.3) | (309.3) |  |
Debt issuance amortization | $ (3.3) | (3.4) |  |
2007 Junior Subordinated Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Coupon Interest Rate | 2.125% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 9.10% |  |  |
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date | $ 0.0 |  |  |
Long-term debt, gross | 0.0 | 143.8 |  |
Amount of unamortized debt discount of debentures | 0.0 | (93.1) |  |
Debt issuance amortization | $ 0.0 | $ (0.7) |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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