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Leases (Balance Sheet Information, Leases) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Operating Leases    
Operating Lease, Right-of-Use Asset $ 136.9  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent  
Operating Lease, Liability $ 164.9  
Finance Leases    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] lgfa:PropertyPlantandEquipmentandFinanceLeaseRightofUseAssetafterAccumulatedDepreciationandAmortization  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations  
Finance Lease, Liabilities $ 42.4 $ 45.4
Operating leases, weighted average remaining lease term 6 years 1 month 6 days  
Finance leases, weighted average remaining lease term 21 years 7 months 6 days  
Operating leases, weighted average discount rate, percent 4.10%  
Finance leases, weighted average discount rate, percent 6.40%  
Other Non-Current Assets    
Operating Leases    
Operating Lease, Right-of-Use Asset $ 136.9  
Accounts Payable and Accrued Liabilities    
Operating Leases    
Operating Leases, Liabilities, current 35.3  
Other Non-Current Liabilities    
Operating Leases    
Operating Leases, Liabilities, non-current 129.6  
Property and equipment, net    
Finance Leases    
Finance Leases, Right-of-Use assets 46.4  
Debt - short-term portion    
Finance Leases    
Finance Lease, Liabilities, Current 3.0  
Debt - non-current    
Finance Leases    
Finance Lease, Liabilities, Non-current $ 39.4