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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, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Dividends declared per common share (in usd per share) | $ 0.09 | $ 0.09 | $ 0 | $ 0.18 | $ 0.09
Total amount | $ 19.3 | $ 19.2 |  | $ 38.5 | $ 19.1
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% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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