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Commitments and Contingencies (Narrative) (Details) shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2018 USD ($) | Oct. 09, 2018 USD ($) | Aug. 30, 2016 | Mar. 16, 2017 plaintiff | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Nov. 05, 2018 USD ($) | Dec. 08, 2016 USD ($) shares | Mar. 31, 2016 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | $ 127.6 | $ 101.8 | $ 93.8 |  |  | $ 90.5
Operating leases, rental expense |  |  |  |  |  | $ 27.0 | 20.7 | 15.6 |  |  |
Multiemployer benefit plans, funded status |  |  |  |  |  | At least 80 percent |  |  |  |  |
Multiemployer benefit plans, period contributions |  |  |  |  |  | $ 56.9 | 70.9 | 59.4 |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingencies, putative class action complaints filed, number |  |  |  | 7 |  |  |  |  |  |  |
Shareholder litigation settlements |  |  |  |  |  | 114.1 | $ 0.0 | $ 0.0 |  |  |
Petitions for appraisal filed | plaintiff |  |  |  |  | 5 |  |  |  |  |  |
Fiduciary Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement payment amount |  |  | $ 92.5 |  |  | 92.5 |  |  |  |  |
Insurance reimbursement, amount |  |  |  |  |  | 37.8 |  |  |  |  |
Shareholder litigation settlements |  |  |  |  |  | 54.8 |  |  |  |  |
Lawsuit for insurance reimbursement, amount |  |  |  |  |  |  |  |  | $ 10.0 |  |
Appraisal Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement payment amount |  | $ 964.0 |  |  |  | 964.0 |  |  |  |  |
Shareholder litigation settlements |  |  |  |  |  | $ 59.3 |  |  |  |  |
Value of original merger consideration, dissenting shareholders liability accrued at time of acquisition |  |  |  |  |  |  |  |  |  | $ 797.3 |
Motion Picture Industry Pension Plan |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Multiemployer benefit plans, funded percentage |  |  |  |  |  | 66.80% |  |  |  |  |
Screen Actors Guild - Producers Pension Plan |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Multiemployer benefit plans, funded percentage |  |  |  |  |  | 76.97% |  |  |  |  |
Starz | Starz Dissenting Shareholders |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding equity interests (in shares) | shares |  |  |  |  |  |  |  |  |  | 22.5 |
Value of original merger consideration, dissenting shareholders liability accrued at time of acquisition | [1] |  |  |  |  |  |  |  |  | $ 797.3 |
[1] | In connection with the Starz Merger, Starz received demands for appraisal from purported holders of approximately 22.5 million shares of Starz Series A common stock, and the Company recorded a dissenting shareholders' liability at the time of acquisition for the value of the original merger consideration attributable to the dissenting shareholders. As of March 31, 2018, the Company had not paid the merger consideration for the shares that had demanded appraisal but had recorded a liability of $869.3 million that was included in current dissenting shareholders' liability on the consolidated balance sheet for the estimated value of the merger consideration that would have been payable for such shares, plus interest accrued at the Federal Reserve discount rate plus 5%, compounded quarterly. In November 2018 a settlement agreement was reached and the dissenting shareholders' liability was paid. See Note 17 for further information.

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