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Shareholders' Equity and Long-Term Incentive Compensation - Common Stock in Treasury, Dividends and Preferred Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Preferred Stock
Preferred stock outstanding (shares)	0	0	0
Authorized no par value preferred stock (in shares)	3,000,000.0	3,000,000.0	3,000,000.0
Common Stock In Treasury
Common Stock in Treasury
Decrease in stock by the settlement of restricted stock units	$ 15.8	$ 27.6	$ 16.9

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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