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Capital Stock (Dividends Declared) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Dividends declared per common share (in usd per share)	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.18	$ 0.09	$ 0.09
Total amount	$ 19.3	$ 19.2	$ 19.1	$ 13.3	$ 38.5	$ 19.1	$ 13.3
5.875% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Coupon rate					5.875%
6.375% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Coupon rate					6.375%

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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