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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,839.1 $ 1,839.1
Accumulated Amortization 151.4 42.4
Net Carrying Amount 1,687.7 1,796.7
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount [1] 1,821.0 1,821.0
Accumulated Amortization [1] 141.4 33.9
Net Carrying Amount [1] 1,679.6 1,787.1
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 8.6 8.6
Accumulated Amortization 7.2 6.9
Net Carrying Amount 1.4 1.7
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 9.5 9.5
Accumulated Amortization 2.8 1.6
Net Carrying Amount $ 6.7 $ 7.9
[1] Customer relationships primarily represent affiliation agreements with distributors acquired in the Starz Merger (see Note 2).