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Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 0.5	$ 1.0
Interest cost	7.7	13.9
Expected return on plant assets	(9.4)	(17.6)
Net periodic pension cost	$ (1.2)	$ (2.7)

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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