Restructuring and Other (Restructuring and Other) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 13.4	$ 7.6	$ 16.4	$ 13.1
COVID-19 related costs	28.4		38.8
Total restructuring and other and COVID-19 related costs	41.8	7.6	55.2	13.1
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other	11.3	2.2	13.4	6.2
Transaction and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other	1.8	5.4	2.2	6.9
COVID-19 related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other	0.3	0.0	0.8	0.0
Cash | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other	8.5	2.2	10.6	5.9
Accelerated vesting on equity awards | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other	2.8	0.0	2.8	0.3
Direct operating expense
Restructuring Cost and Reserve [Line Items]
COVID-19 related costs	22.3	0.0	28.1	0.0
Distribution and marketing
Restructuring Cost and Reserve [Line Items]
COVID-19 related costs	$ 6.1	$ 0.0	$ 10.7	$ 0.0