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Additional Financial Information (Non-Cash Investing and Financing Activities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Non-cash investing activities |  |  |
Issuance of common shares related to acquisitions and mergers | $ 1,327.7 | $ 57.0 |
Issuance of common shares related to investments |  |  | $ 170.9
Investment in cost method investments | 0.0 | 0.0 | 12.0
Non-cash financing activities |  |  |
Accrued dividends (see Note 13) | 0.0 | 13.2 | 10.2
Starz |  |  |
Non-cash investing activities |  |  |
Issuance of common shares related to acquisitions and mergers | 1,327.7 | 0.0 | 0.0
Accrued purchase consideration for dissenting shareholders | 797.3 | 0.0 | 0.0
Issuance of Starz share-based payment replacement awards | 186.5 | 0.0 | 0.0
Pilgrim Media Group |  |  |
Non-cash investing activities |  |  |
Issuance of common shares related to acquisitions and mergers | 0.0 | 57.0 | 0.0
Available-for-sale Securities |  |  |
Non-cash investing activities |  |  |
Issuance of common shares related to investments | 0.0 | 0.0 | 158.9
Convertible Senior Subordinated Notes |  |  |
Non-cash financing activities |  |  |
Conversions of convertible senior subordinated notes | 41.9 | 16.2 | 24.2
Conversion of Convertible Senior Subordinated Notes | Convertible Senior Subordinated Notes |  |  |
Non-cash financing activities |  |  |
Conversions of convertible senior subordinated notes | $ 41.9 | $ 16.2 | $ 24.2

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