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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, 2021	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Dividends declared per common share (in usd per share)	$ 0.09	$ 0.09	$ 0	$ 0	$ 0.18
Total amount	$ 19.3	$ 19.2			$ 38.5
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
-Subparagraph (SX 210.3-04)
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Topic 210
-SubTopic 10
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

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