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Mergers and Acquisitions (Components of Estimated Purchase Consideration) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 08, 2016 | Mar. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |
Dissenting shareholders' liability |  | $ 812.9 | $ 840.1
Cost basis |  | 2.6 | 2.6
Starz |  |  |
Business Acquisition [Line Items] |  |  |
Market value, as of December 8, 2016, of Starz Series A and Series B common stock already owned by Lionsgate | $ 179.3 |  |
Cash consideration paid to Starz stockholders | 1,176.1 |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | 1,327.7 |  |
Replacement of Starz share-based payment awards | 186.5 |  |
Total preliminary estimated purchase consideration | 3,666.9 |  |
Cost basis | 158.9 |  |
Gain recognized on Starz available-for-sale securities |  | $ 20.4 |
Replacement of Starz share-based payment awards, unvested | 43.3 |  |
Starz Series A Common Stock | Starz |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration paid to Starz stockholders | $ 1,123.3 |  |
Cash to be paid per outstanding share (in usd per share) | $ 18.00 |  |
Starz Series A Common Stock | Starz | Class B Non-Voting Shares |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | $ 1,088.0 |  |
Stock conversion ratio | 0.6784 |  |
Starz Series B Common Stock | Starz |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration paid to Starz stockholders | $ 52.8 |  |
Cash to be paid per outstanding share (in usd per share) | $ 7.26 |  |
Starz Series B Common Stock | Starz | Class B Non-Voting Shares |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | $ 118.1 |  |
Stock conversion ratio | 0.6321 |  |
Starz Series B Common Stock | Starz | Class A Voting Shares |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | $ 121.6 |  |
Stock conversion ratio | 0.6321 |  |
Starz Dissenting Shareholders | Starz |  |  |
Business Acquisition [Line Items] |  |  |
Dissenting shareholders' liability | $ 797.3 |  | $ 840.1

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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