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Leases (Balance Sheet Information, Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Mar. 31, 2020
Operating Leases    
Operating leases, right-of-use assets $ 128.7 $ 136.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent  
Operating leases, lease liabilities (current) $ 39.9 35.3
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent  
Operating leases, lease liabilities (non-current) $ 122.8 129.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent  
Operating leases, lease liabilities $ 162.7 164.9
Finance Leases    
Finance leases, right-of-use assets $ 0.8 46.4
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] lgfa:PropertyPlantandEquipmentandFinanceLeaseRightofUseAssetafterAccumulatedDepreciationandAmortization  
Finance leases, lease liabilities (current) $ 0.4 3.0
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent  
Finance leases, lease liabilities (non-current) $ 0.0 39.4
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations  
Finance lease, lease liabilities $ 0.4 $ 42.4
Operating leases, weighted average remaining lease term 5 years 4 months 24 days 6 years 1 month 6 days
Finance leases, weighted average remaining lease term 2 months 12 days 21 years 7 months 6 days
Operating leases, weighted average discount rate, percent 3.90% 4.10%
Finance leases, weighted average discount rate, percent 7.00% 6.40%