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Contingencies (Narrative) (Details) shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2018 USD ($) | Oct. 09, 2018 USD ($) | Aug. 30, 2016 class_action_complaint | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Mar. 16, 2017 plaintiff | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Nov. 05, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shareholder litigation settlements | [1] |  |  |  | $ 114.1 | $ 0.0 |  | $ 114.1 | $ 0.0 |  |  |
Dissenting shareholders' liability |  |  |  |  | $ 961.3 |  |  | $ 961.3 |  |  |  | $ 869.3
Petitions for appraisal filed | plaintiff |  |  |  |  |  |  | 5 |  |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding equity interests (in shares) | shares |  |  |  |  | 22.5 |  |  | 22.5 |  |  |  |
Fiduciary Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | class_action_complaint |  |  |  | 7 |  |  |  |  |  |  |  |
Settlement payment amount |  |  |  |  | $ 92.5 |  |  | $ 92.5 |  |  |  |
Insurance reimbursement receivable |  |  |  |  | 37.8 |  |  | 37.8 |  |  |  |
Shareholder litigation settlements |  |  |  |  | 54.8 |  |  | 54.8 |  |  |  |
Appraisal Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment amount |  |  |  |  | 961.0 |  |  | 961.0 |  |  |  |
Dissenting shareholders' liability before settlement amount |  |  |  |  | 901.9 |  |  | 901.9 |  |  |  |
Shareholder litigation settlements |  |  |  |  | 59.3 |  |  | $ 59.3 |  |  |  |
Dissenting shareholders' liability |  |  |  |  |  |  |  |  |  |  | $ 885.2 |
Dissenting shareholders' liability, previously accrued interest |  |  |  |  |  |  |  |  |  |  | $ 87.9 |
Dissenting shareholders' liability, accrued interest for the quarter |  |  |  |  | $ 16.7 |  |  |  |  |  |  |
Subsequent Event | Fiduciary Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment amount |  |  | $ 92.5 |  |  |  |  |  |  |  |  |
Lawsuit for insurance reimbursement, amount |  |  |  |  |  |  |  |  |  | $ 10.0 |  |
Subsequent Event | Appraisal Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment amount |  | $ 961.0 |  |  |  |  |  |  |  |  |  |
[1] | Shareholder litigation settlements of $114.1 million in the three and six months ended September 30, 2018 includes the following: (i) $54.8 million for the net expense recorded for the settlement of the Fiduciary Litigation (representing the settlement amount of $92.5 million, which the Company has included in accounts payable and accrued liabilities in the unaudited condensed consolidated balance sheet, net of aggregate insurance reimbursement of $37.8 million, which amount the Company has recorded a receivable included in the "other current assets" line item in the unaudited condensed consolidated balance sheet as of September 30, 2018) and (ii) $59.3 million related to the Appraisal Litigation, representing the amount by which the settlement amount of approximately $961 million exceeds the previously accrued $901.9 million dissenting shareholders' liability, before considering the settlement (i.e., dissenting shareholders' liability plus accrued interest through September 30, 2018). See Note 16.

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