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Capital Stock (Share-based Compensation Expense by Category) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 15.1	$ 23.6	$ 30.2	$ 47.4
Direct operating
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	0.3	0.2	0.5	0.5
Distribution and marketing
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	0.1	0.2	0.1	0.4
General and administration
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 14.7	$ 23.2	$ 29.6	$ 46.5

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors, certain consultants qualifying for treatment as employees, including the impact of compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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