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Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained earnings	Total Accumulated Other Comprehensive Income	Noncontrolling Interest
Balance, beginning of period at Dec. 31, 2018		$ 1.4	$ 3,304.7	$ (1,025.1)	$ 1,074.5	$ 40.1	$ 56.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend equivalent units on dividends declared			6.0
Share-based compensation for equity-classified awards			11.6
Common stock repurchases	$ 98.8			(98.8)
Repurchase of employee common stock relinquished for tax withholding	1.4			(1.4)
Net (loss) income	124.2				124.2
Dividends declared ($0.000 per share, $1.980 per share)					(220.4)
Postretirement plans and workers' compensation obligations (net of $0.0 tax provisions in each period)						(2.2)
Foreign currency translation adjustment	0.1					0.1
Net (loss) income	129.9						5.7
Distributions to noncontrolling interests							(14.3)
Balance, end of period at Mar. 31, 2019	3,262.1	1.4	3,322.3	(1,125.3)	978.3	38.0	47.4
Balance, beginning of period at Dec. 31, 2019	2,672.5	1.4	3,351.1	(1,367.3)	597.0	31.6	58.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation for equity-classified awards			2.2
Common stock repurchases	0.0			0.0
Repurchase of employee common stock relinquished for tax withholding	0.8			(0.8)
Net (loss) income	(129.7)				(129.7)
Dividends declared ($0.000 per share, $1.980 per share)					0.0
Postretirement plans and workers' compensation obligations (net of $0.0 tax provisions in each period)						(2.2)
Foreign currency translation adjustment	(6.8)					(6.8)
Net (loss) income	(131.5)						(1.8)
Distributions to noncontrolling interests							(0.1)
Balance, end of period at Mar. 31, 2020	$ 2,533.3	$ 1.4	$ 3,353.3	$ (1,368.1)	$ 467.3	$ 22.6	$ 56.8

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