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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | The following table shows the carrying amounts and fair values of the Company’s senior and junior subordinated convertible debt as of March 31, 2018 and 2017 (amounts in millions). As of March 31, 2018 and March 31, 2017, the carrying amounts of the Company's senior and junior subordinated convertible debt have been reduced by debt issuance costs of $34.2 million and $38.3 million, respectively.
| March 31,
| 2018 |  | 2017
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
2017 Senior Debt | $ | 1,437.6 |  |  | $ | 2,459.2 |  |  | $ | 1,384.9 |  |  | $ | 2,106.2 |
2015 Senior Debt | $ | 1,309.9 |  |  | $ | 3,079.1 |  |  | $ | 1,261.8 |  |  | $ | 2,481.7 |
2017 Junior Debt | $ | 326.7 |  |  | $ | 876.9 |  |  | $ | 262.3 |  |  | $ | 586.6 |
2007 Junior Debt | $ | — |  |  | $ | — |  |  | $ | 50.0 |  |  | $ | 445.1 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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