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Consolidated Statement of Shareholders Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	[1]	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	[1]	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common stock cash dividends (in dollars per share)	$ 2.41		$ 1.16	$ 1.16	$ 2.17		$ 1.01	$ 1.01	$ 4.73	$ 4.19	$ 3.83
Stock option exercises and other, tax benefits									$ 0.0	$ 0.0	$ 0.0
[1] Includes a $1.16 and $1.01 per share dividend declared and paid in third quarter of 2019 and 2018, respectively, and a $1.25 and $1.16 per share dividend declared in the third quarter and paid in fourth quarter of 2019 and 2018, respectively.

X

- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 2: 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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 740
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116859624&loc=d3e23524-113945

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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