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Share-based Compensation Awards (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based Payment Award
Vesting period in which the fair value of shares on grant date is amortized over, years	two years
Stock-settled awards
Stock-based Payment Award
Awards granted	2.3	2.5	2.1
Weighted-average grant-date fair value (per award)	$ 20.70	$ 22.78	$ 23.60
Total fair value of vested awards distributed	$ 17.3	$ 15.2	$ 24.2
Accrued dividends on non-vested stock-settled awards	5.6	4.2
Dividends paid for stock-settled awards	$ 1.5	$ 1.2
Cash-settled awards
Stock-based Payment Award
Awards granted	0.0	0.0	0.1
Weighted-average grant-date fair value (per award)	$ 21.02	$ 22.83	$ 23.62
Total fair value of vested awards distributed	$ 0.3	$ 0.9	$ 0.8
Performance-based awards
Stock-based Payment Award
Awards granted	2.4	2.1	2.9
Weighted-average grant-date fair value (per award)	$ 18.67	$ 20.16	$ 21.13
Total fair value of vested awards distributed	$ 53.3	$ 64.9	$ 87.2

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- Definition

Award Vesting Period

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- Definition

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- Definition

Stock based awards expected to be settled in cash

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- Definition

Amount of paid and unpaid stock dividends declared for award under share-based payment arrangement.

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- 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

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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