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Capital Management and Dividends - Summary of Dividends Declared or Paid (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Dividends Payable [Line Items] |  |  |  |
Dividend, Total Amount |  | $ 176.8 | $ 246.5 | $ 390.1
Dividend, Record Date | Jun. 08, 2017 |  |  |
Dividend, Payment Date | Aug. 04, 2017 |  |  |
FY 2017 First Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.10 |  |
Dividend, Total Amount |  | $ 46.6 |  |
Dividend, Announcement Date |  | Nov. 17, 2016 |  |
Dividend, Record Date |  | Dec. 21, 2016 |  |
Dividend, Payment Date |  | Feb. 24, 2017 |  |
FY 2016 Second Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.29 |  |
Dividend, Total Amount |  | $ 130.2 |  |
Dividend, Announcement Date |  | May 19, 2016 |  |
Dividend, Record Date |  | Jun. 09, 2016 |  |
Dividend, Payment Date |  | Aug. 05, 2016 |  |
FY 2016 First Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.09 |  |
Dividend, Total Amount |  | $ 39.7 |  |
Dividend, Announcement Date |  | Nov. 19, 2015 |  |
Dividend, Record Date |  | Dec. 23, 2015 |  |
Dividend, Payment Date |  | Feb. 26, 2016 |  |
FY 2015 Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.22 |  |
Dividend, Total Amount |  | $ 92.8 |  |
Dividend, Announcement Date |  | May 21, 2015 |  |
Dividend, Record Date |  | Jun. 11, 2015 |  |
Dividend, Payment Date |  | Aug. 07, 2015 |  |
FY 2015 Second Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.27 |  |
Dividend, Total Amount |  | $ 114.0 |  |
Dividend, Announcement Date |  | May 21, 2015 |  |
Dividend, Record Date |  | Jun. 11, 2015 |  |
Dividend, Payment Date |  | Aug. 07, 2015 |  |
FY 2015 First Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.08 |  |
Dividend, Total Amount |  | $ 34.2 |  |
Dividend, Announcement Date |  | Nov. 19, 2014 |  |
Dividend, Record Date |  | Dec. 23, 2014 |  |
Dividend, Payment Date |  | Feb. 27, 2015 |  |
FY 2014 Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.20 |  |
Dividend, Total Amount |  | $ 89.0 |  |
Dividend, Announcement Date |  | May 22, 2014 |  |
Dividend, Record Date |  | Jun. 12, 2014 |  |
Dividend, Payment Date |  | Aug. 08, 2014 |  |
FY 2014 Second Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.32 |  |
Dividend, Total Amount |  | $ 142.3 |  |
Dividend, Announcement Date |  | May 22, 2014 |  |
Dividend, Record Date |  | Jun. 12, 2014 |  |
Dividend, Payment Date |  | Aug. 08, 2014 |  |
125 Year Anniversary Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.28 |  |
Dividend, Total Amount |  | $ 124.6 |  |
Dividend, Announcement Date |  | Feb. 28, 2014 |  |
Dividend, Record Date |  | Mar. 21, 2014 |  |
Dividend, Payment Date |  | May 30, 2014 |  |

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- Definition Aggregate dividends paid 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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