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Incentive Compensation Plans Stock Option Activity (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
Intrinsic value of stock options exercised	$ 5.3	$ 9.1	$ 27.9
Proceeds from stock options exercised including taxes withheld	9.1	8.3	29.0
Tax withheld on stock options received	$ 2.6	$ 4.0	$ 13.3
Employee Stock Option
Stock-based Payment Award
Stock options outstanding as of January 1, 2018	1.2
Stock options outstanding as of Jan 1, 2018, Weighted-average exercise price	$ 12.26
Exercised	(0.6)	(0.6)	(1.9)
Exercised, weighted-average exercise price	$ 11.70
Stock options outstanding as of December 31, 2018	0.6	1.2
Stock options outstanding as of Dec 31, 2018, Weighted-average exercise price	$ 12.75	$ 12.26
Options outstanding, weighted average remaining contractual term	2 years 2 months 12 days
Stock options outstanding, aggregate intrinsic value	$ 6.8

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options including cash for taxes withheld. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Tax Withheld on Stock Options Received

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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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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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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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