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Share-Based Payments (Weighted-Average Fair Value of Options and Stock Per Share) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units (RSUs) [Member]
Stock, weighted average grant date fair value	$ 62.91	$ 63.60	$ 55.96
Employee Stock Purchase Plan [Member]
Options, weighted average grant date fair value	4.82	4.32	2.67
Discount of grant date market value	8.61	9.99	8.50
Total ESPP	13.43	14.31	11.17
Agent Stock Purchase Plan [Member]
Stock, weighted average grant date fair value	$ 5.73	$ 7.00	$ 5.99

X

- Definition

The weighted average fair value discount at grant date, for employee stock purchase plan shares issued during the period.

+ References

No definition available.

+ Details

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X

- Definition

The total weighted average fair value at grant date for employee stock purchase plan shares issued during the period.

+ References

No definition available.

+ Details

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X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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