Aggregate dividends paid during the period for each share of common stock outstanding.

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

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions						12 Months Ended
	Jan. 15, 2016	Dec. 15, 2015	Apr. 15, 2015	Feb. 26, 2015	Dec. 09, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common stock dividends paid						$ 200.8	$ 157.4	$ 109.1
Dividends declared per common share (US$ per share)		$ 0.55				$ 2.20	$ 1.60	$ 1.51
Common Stock, Dividends, Per Share, Cash Paid			$ 0.55
Subsequent Event
Common stock dividends paid	$ 53.1
Annual Dividend [Member]
Dividends declared per common share (US$ per share)				$ 2.20	$ 1.60