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Restructuring and Other (Restructuring and Other) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 3.5	$ 13.4	$ 6.7	$ 16.4
COVID-19 related charges (benefit)	(0.8)	28.4	0.8	38.8
Total restructuring and other and COVID-19 related charges	2.7	41.8	7.5	55.2
Direct operating expense
Restructuring Cost and Reserve [Line Items]
COVID-19 related charges (benefit)	(1.0)	22.3	0.5	28.1
Distribution and marketing
Restructuring Cost and Reserve [Line Items]
COVID-19 related charges	0.2	6.1	0.3	10.7
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other	1.3	11.3	3.8	13.4
Severance | Cash
Restructuring Cost and Reserve [Line Items]
Restructuring and other	1.3	8.5	3.8	10.6
Severance | Accelerated vesting on equity awards
Restructuring Cost and Reserve [Line Items]
Restructuring and other	0.0	2.8	0.0	2.8
COVID-19 related charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other	0.5	0.3	0.8	0.8
Transaction and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 1.7	$ 1.8	$ 2.1	$ 2.2

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