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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,879.5 $ 1,832.5
Accumulated Amortization 257.9 144.8
Net Carrying Amount 1,621.6 1,687.7
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount [1] 1,852.0 1,821.0
Accumulated Amortization [1] 250.8 141.4
Net Carrying Amount [1] 1,601.2 1,679.6
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3.6 2.0
Accumulated Amortization 1.0 0.6
Net Carrying Amount 2.6 1.4
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 23.9 9.5
Accumulated Amortization 6.1 2.8
Net Carrying Amount $ 17.8 $ 6.7
[1] Customer relationships primarily represent affiliation agreements with distributors acquired in the Starz Merger.