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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Postretirement plans and workers' compensation obligations, tax provision	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Retained earnings
Dividends declared per share	$ 0.145	$ 0.125	$ 2.265	$ 0.355
Total Accumulated Other Comprehensive Income
Postretirement plans and workers' compensation obligations, tax provision	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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