Shareholders' Equity and Noncontrolling Interests, Dividends (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
Oct. 20, 2020	Oct. 19, 2020	Mar. 31, 2021	Mar. 31, 2020
Shareholders' Equity and Noncontrolling Interests
Dividends declared per share (in dollars per share)	$ 0.145	$ 0.125	$ 0.145	$ 0.125
Dividends declared			$ 86.6	$ 74.0
Dividends paid (including those declared in the prior year)			$ 86.8	$ 74.4

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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