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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Capital Unit [Line Items] |  |
Treasury stock, shares (shares) | 24,637,673 | 24,708,917
Common stock, shares authorized (shares) | 180,000,000 |
Common stock, par value (dollars per share) | $ 0 | $ 0
Common stock, shares, outstanding (shares) | 37,443,718 | 37,372,474
Second Cumulative Preferred Voting Stock |  |
Capital Unit [Line Items] |  |
Preferred stock, shares authorized (shares) | 1,000,000 |
Preferred stock, par value (dollars per share) | $ 10 |
Preferred stock, shares issued (shares) | 0 |
Treasury Stock |  |
Capital Unit [Line Items] |  |
Reissued shares (shares) | 106,508 |
4 1/2% Cumulative Preferred Nonvoting Stock |  |
Capital Unit [Line Items] |  |
Preferred stock, shares authorized (shares) | 100,000 |
Preferred stock, par value (dollars per share) | $ 50 |
Percentage of cumulative preferred stock (percent) | 4.50% |
Preferred stock, callable price per share (dollars per share) | $ 52.50 |
Preferred stock, shares issued (shares) | 71,340 |
Treasury stock, shares (shares) | 52,878 |
Purchase of treasury shares (shares) | 0 |
Common Stock |  |
Capital Unit [Line Items] |  |
Purchase of treasury shares (shares) | 0 |
Common stock, shares issued (shares) |  | 62,081,391
Stock issued during period, new issues (shares) | 0 |
Common stock, value, issued |  | $ 100.0

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