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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, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Dividends Payable [Line Items] |  |  |  |
Dividend, Total Amount |  | $ 246.5 | $ 390.1 | $ 199.1
Dividend, Record Date | Jun. 09, 2016 |  |  |
Dividend, Payment Date | Aug. 05, 2016 |  |  |
125 Year Anniversary Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.28 | $ 0.28 | $ 0.28
Dividend, Total Amount |  | $ 124.6 | $ 124.6 | $ 124.6
Dividend, Announcement Date |  | Feb. 28, 2014 | Feb. 28, 2014 | Feb. 28, 2014
Dividend, Record Date |  | Mar. 21, 2014 | Mar. 21, 2014 | Mar. 21, 2014
Dividend, Payment Date |  | May 30, 2014 | May 30, 2014 | May 30, 2014
FY 2015 First Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.08 | $ 0.08 | $ 0.08
Dividend, Total Amount |  | $ 34.2 | $ 34.2 | $ 34.2
Dividend, Announcement Date |  | Nov. 19, 2014 | Nov. 19, 2014 | Nov. 19, 2014
Dividend, Record Date |  | Dec. 23, 2014 | Dec. 23, 2014 | Dec. 23, 2014
Dividend, Payment Date |  | Feb. 27, 2015 | Feb. 27, 2015 | Feb. 27, 2015
FY 2014 First Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.08 | $ 0.08 | $ 0.08
Dividend, Total Amount |  | $ 35.5 | $ 35.5 | $ 35.5
Dividend, Announcement Date |  | Nov. 14, 2013 | Nov. 14, 2013 | Nov. 14, 2013
Dividend, Record Date |  | Dec. 19, 2013 | Dec. 19, 2013 | Dec. 19, 2013
Dividend, Payment Date |  | Mar. 28, 2014 | Mar. 28, 2014 | Mar. 28, 2014
FY 2014 Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.20 | $ 0.20 | $ 0.20
Dividend, Total Amount |  | $ 89.0 | $ 89.0 | $ 89.0
Dividend, Announcement Date |  | May 22, 2014 | May 22, 2014 | May 22, 2014
Dividend, Record Date |  | Jun. 12, 2014 | Jun. 12, 2014 | Jun. 12, 2014
Dividend, Payment Date |  | Aug. 08, 2014 | Aug. 08, 2014 | Aug. 08, 2014
FY 2014 Second Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.32 | $ 0.32 | $ 0.32
Dividend, Total Amount |  | $ 142.3 | $ 142.3 | $ 142.3
Dividend, Announcement Date |  | May 22, 2014 | May 22, 2014 | May 22, 2014
Dividend, Record Date |  | Jun. 12, 2014 | Jun. 12, 2014 | Jun. 12, 2014
Dividend, Payment Date |  | Aug. 08, 2014 | Aug. 08, 2014 | Aug. 08, 2014
FY 2013 Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.24 | $ 0.24 | $ 0.24
Dividend, Total Amount |  | $ 106.1 | $ 106.1 | $ 106.1
Dividend, Announcement Date |  | May 23, 2013 | May 23, 2013 | May 23, 2013
Dividend, Record Date |  | Jun. 28, 2013 | Jun. 28, 2013 | Jun. 28, 2013
Dividend, Payment Date |  | Jul. 26, 2013 | Jul. 26, 2013 | Jul. 26, 2013
FY 2012 Second Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.13 | $ 0.13 | $ 0.13
Dividend, Total Amount |  | $ 57.5 | $ 57.5 | $ 57.5
Dividend, Announcement Date |  | May 23, 2013 | May 23, 2013 | May 23, 2013
Dividend, Record Date |  | Jun. 28, 2013 | Jun. 28, 2013 | Jun. 28, 2013
Dividend, Payment Date |  | Jul. 26, 2013 | Jul. 26, 2013 | Jul. 26, 2013
FY 2016 First Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.09 | $ 0.09 | $ 0.09
Dividend, Total Amount |  | $ 39.7 | $ 39.7 | $ 39.7
Dividend, Announcement Date |  | Nov. 19, 2015 | Nov. 19, 2015 | Nov. 19, 2015
Dividend, Record Date |  | Dec. 23, 2015 | Dec. 23, 2015 | Dec. 23, 2015
Dividend, Payment Date |  | Feb. 26, 2016 | Feb. 26, 2016 | Feb. 26, 2016
FY 2015 Special Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.22 | $ 0.22 | $ 0.22
Dividend, Total Amount |  | $ 92.8 | $ 92.8 | $ 92.8
Dividend, Announcement Date |  | May 21, 2015 | May 21, 2015 | May 21, 2015
Dividend, Record Date |  | Jun. 11, 2015 | Jun. 11, 2015 | Jun. 11, 2015
Dividend, Payment Date |  | Aug. 07, 2015 | Aug. 07, 2015 | Aug. 07, 2015
FY 2015 Second Half Dividend [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Interim ordinary dividend to shareholders |  | $ 0.27 | $ 0.27 | $ 0.27
Dividend, Total Amount |  | $ 114.0 | $ 114.0 | $ 114.0
Dividend, Announcement Date |  | May 21, 2015 | May 21, 2015 | May 21, 2015
Dividend, Record Date |  | Jun. 11, 2015 | Jun. 11, 2015 | Jun. 11, 2015
Dividend, Payment Date |  | Aug. 07, 2015 | Aug. 07, 2015 | Aug. 07, 2015

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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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