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Stock-Based Compensation (Stock Options) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised, shares	(1.1)	(0.4)	(0.5)
Exercised, weighted-average exercise price (in dollars per share)	$ 49.91	$ 33.87	$ 35.25
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	10 years
Vesting period (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance (in shares)	2.6
Options outstanding, weighted-average exercise price, beginning balance (in dollars per share)	$ 52.29
Granted, shares	0.0
Granted, weighted-average exercise price (in dollars per share)	$ 0
Exercised, shares	(1.1)
Exercised, weighted-average exercise price (in dollars per share)	$ 49.91
Forfeited, shares	0.0
Forfeited, weighted-average exercise price (in dollars per share)	$ 0
Expired, shares	(0.3)
Expired, weighted-average exercise price (in dollars per share)	$ 58.00
Options outstanding, ending balance (in shares)	1.2	2.6
Options outstanding, weighted-average exercise price, ending balance (in dollars per share)	$ 52.78	$ 52.29
Options outstanding, weighted-average remaining contractual term (years)	3 years 6 months 10 days
Options outstanding, aggregate intrinsic value	$ 19.7
Options available for future grants (in shares)	3.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of stock options exercised	$ 9.8	$ 5.2	$ 8.2

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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