Consolidated Statement of Changes in Equity (Parenthetical) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Dividends	$ (276.6)
Common stock
Dividends declared (in usd per share)	$ 0.2979	$ 0.257
Dividends paid (in usd per share)	0.2979	0.257
ADS
Dividends declared (in usd per share)	0.8937	0.771
Dividends paid (in usd per share)	$ 0.8937	$ 0.771
Retained earnings
Dividends	$ (276.6)	$ (234.7)

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

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

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