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Capital Stock (Dividends Declared) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in usd per share) | $ 0.09 | $ 0.09 | [1] | $ 0.09 | $ 0.09 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.05 | $ 0.09 | $ 0.34 | $ 0.26
Total amount | $ 13.3 | $ 13.2 | [1] | $ 13.5 | $ 13.3 | $ 10.4 | $ 10.1 | $ 9.8 | $ 9.6 | $ 6.9 | $ 13.3 | $ 50.4 | $ 36.4
Cash dividends payable |  | $ 13.2 |  |  |  |  | $ 10.2 |  |  |  | $ 0.0 | $ 13.2 | $ 10.2
[1] | As of March 31, 2016, the Company had $13.2 million of cash dividends payable included in accounts payable and accrued liabilities on the consolidated balance sheet (2017 - none).

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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