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Investments (Summarized Statement Of Income) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 11, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of net income (loss) reported by investee to equity interest income (loss): |  |  |  |  |  |
Total equity interest income (loss) recorded |  |  | $ (13.8) | $ (1.5) | $ (34.8) | $ 11.2
Pop |  |  |  |  |  |
Reconciliation of net income (loss) reported by investee to equity interest income (loss): |  |  |  |  |  |
Ownership interest in investee |  |  | 50.00% |  | 50.00% |
Total equity interest income (loss) recorded |  |  | $ (1.4) | (2.6) | $ (3.9) | (4.6)
EPIX |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenues |  | $ 44.8 |  | 101.5 |  | 298.3
Expenses: |  |  |  |  |  |
Operating expenses |  | 32.3 |  | 73.2 |  | 193.5
Selling, marketing and general and administrative expenses |  | 2.4 |  | 5.3 |  | 18.2
Operating income (loss) |  | 10.1 |  | 23.0 |  | 86.6
Interest and other expense |  | 0.0 |  | (0.1) |  | (0.3)
Reconciliation of net income (loss) reported by investee to equity interest income (loss): |  |  |  |  |  |
Net income (loss) |  | $ 10.1 |  | $ 22.9 |  | $ 86.3
Ownership interest in investee |  | 31.15% |  | 31.15% |  | 31.15%
The Company's share of net income (loss) |  | $ 3.1 |  | $ 7.1 |  | $ 26.9
Eliminations of the Company's share of profits on licensing sales to investee | [1] | (0.1) |  | (3.7) |  | (10.4)
Realization of the Company's share of profits on licensing sales to investee | [2] | 1.0 |  | 1.9 |  | 4.8
Total equity interest income (loss) recorded |  | $ 4.0 | $ 0.0 | $ 5.3 | $ 4.0 | $ 21.3
[1] | Represents the elimination of the gross profit recognized by the Company on licensing sales to EPIX in proportion to the Company's ownership interest in EPIX.
[2] | Represents the realization of a portion of the profits previously eliminated. This profit remained eliminated until realized by EPIX. EPIX initially recorded the license fee for the title as inventory on its balance sheet and amortizes the inventory over the license period. Accordingly, the profit was realized as the inventory on EPIX's books was amortized.

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