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Restructuring and Other (Restructuring and Other) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and other		$ 24.3	$ 78.0	$ 59.8
Programming and content charges		76.5	35.1	0.0
COVID-19 related costs	$ 50.2
Total restructuring and other, programming and content charges, and COVID-19 related costs		151.0	113.1	59.8
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other		12.9	47.5	24.4
COVID-19 related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other		0.3	0.0	0.0
Transaction and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other		11.1	30.5	22.2
Development expense
Restructuring Cost and Reserve [Line Items]
Restructuring and other		0.0	0.0	13.2
Cash | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other		12.3	31.5	21.5
Accelerated vesting on equity awards | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other		0.6	16.0	2.9
Direct operating expense
Restructuring Cost and Reserve [Line Items]
COVID-19 related costs		46.0	0.0	0.0
Distribution and marketing expense
Restructuring Cost and Reserve [Line Items]
COVID-19 related costs		$ 4.2	$ 0.0	$ 0.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233

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