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Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Postretirement plans and workers' compensation obligations, tax provision | $ 0.0 | $ 0.0
Retained earnings |  |
Dividends declared per share | $ 0.000 | $ 1.980
Total Accumulated Other Comprehensive Income |  |
Postretirement plans and workers' compensation obligations, tax provision | $ 0.0 | $ 0.0

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