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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) shares in Millions, $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2018 | Mar. 31, 2017
Restricted cash | $ 40.8 | $ 42.1 | $ 39.1 | $ 0.0
2017 Junior Convertible Debt |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs | $ 111.3 |  |  |
2007 Junior Convertible Debt | Long-term Debt |  |  |  |
Stock issued during period, exchange of convertible securities (in shares) | 3.2 |  |  |
Extinguishment of debt | $ 111.3 | $ 32.5 |  |

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