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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock in Treasury
Retirement of treasury stock (in shares)			0
Amount of retirement of treasury stock			$ 0.0
Preferred Stock
Authorized no par value preferred stock (in shares)	3,000,000.0	3,000,000	3,000,000
Preferred stock outstanding (shares)	0	0	0
Common Stock In Treasury
Common Stock in Treasury
Retirement of treasury stock (in shares)			(50,000,000)
Amount of retirement of treasury stock			$ 2,948.1
Decrease in stock by the settlement of restricted stock units	$ 27.6	$ 16.9	$ 17.9

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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 of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the par value method.

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Number of shares of common and preferred stock retired from treasury during the period.

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