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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Postretirement plans and workers' compensation obligations, tax provision	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Retained earnings
Dividends declared per share	$ 0.000	$ 0.140	$ 0.000	$ 2.120
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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