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Significant Accounting Policies Treasury Stock (Policies) | 12 Months Ended
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Dec. 31, 2019
Treasury Stock, Shares [Abstract] |
Treasury Stock [Text Block] | Treasury Stock We account for repurchased common stock under the cost method and include such treasury stock as a component of our Consolidated Statements of Stockholders' Equity. Upon retirement, we reduce common stock for the par value of the shares being retired and the excess of the cost of the shares over par value as a reduction to APIC, to the extent there is APIC in the same class of stock, and any remaining amount to retained earnings. These retired shares remain authorized but unissued. During 2019, there was no significant treasury stock activity due to the suspension of the share repurchase program, as disclosed further in Note 7. In October 2018, we retired 8.1 shares of our treasury stock, which resulted in a reduction in common stock of $0.8, treasury stock of $176.1 and APIC of $175.3. In October and November 2017, we retired 13.4 shares of our treasury stock, which resulted in a reduction in common stock of $1.3, treasury stock of $304.4 and APIC of $303.1.

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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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