Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Components of the provision for income taxes

The components of the provision for income taxes from continuing operations are as follows:

	Year Ended December 31,
	2018			2017			2016
	(in millions)
Current:
Federal	$	(19.1	)	$	(61.1	)	$	(195.9	)
State	(1.5		)	(1.1		)	(3.2		)
Foreign	5.3			4.5			4.4
Total current	(15.3		)	(57.7		)	(194.7		)
Deferred:
Federal
Effect of Tax Cuts and Jobs Act	(5.9		)	(476.2		)	—
Other	49.1			121.9			294.0
	43.2			(354.3		)	294.0
State	14.7			(2.8		)	11.0
Foreign	—			—			(3.5		)
Total deferred	57.9			(357.1		)	301.5
Provision	$	42.6		$	(414.8	)	$	106.8

Reconciliation between the statutory U.S. Federal income tax rate and the Company's effective income tax rate

The following is a reconciliation between the statutory U.S. federal income tax rate and our effective income tax rate on income before income taxes:

	Year Ended December 31,
	2018		2017		2016
Statutory rate	21.0	%	35.0	%	35.0	%
Effect of Tax Cuts and Jobs Act	(3.9	)	(243.7	)	—
State taxes	2.3		(1.9	)	1.2
Foreign taxes	2.9		—		—
Noncontrolling interest in partially-owned subsidiaries	(0.5	)	(2.0	)	(2.4	)
Settlements with tax authorities	—		(2.1	)	(0.1	)
Equity compensation	(1.4	)	0.8		—
Changes in valuation allowances and reserves	1.6		1.9		(1.2	)
Interest expense limitations	1.3		—		—
Changes in state laws and apportionment	5.2		(0.5	)	1.4
Other, net	(0.4	)	0.3		0.6
Effective rate	28.1	%	(212.2	)%	34.5	%

Components of deferred tax liabilities and assets

The components of deferred tax liabilities and assets are as follows:

	December 31,
	2018			2017
	(in millions)
Deferred tax liabilities:
Depreciation, depletion, and amortization	$	718.4		$	578.9
Partially-owned subsidiaries basis difference	131.7			117.2
Convertible debt	—			91.4
Total deferred tax liabilities	850.1			787.5
Deferred tax assets:
Workers compensation, pensions, and other benefits	5.7			6.6
Warranties and reserves	8.1			5.8
Equity items	34.0			31.9
Tax loss carryforwards and credits	65.5			24.8
Inventory	8.9			7.2
Accrued liabilities and other	9.1			8.1
Total deferred tax assets	131.3			84.4
Net deferred tax liabilities before valuation allowances	718.8			703.1
Valuation allowances	15.1			7.8
Net deferred tax liabilities before reserve for uncertain tax positions	733.9			710.9
Deferred tax assets included in reserve for uncertain tax positions	(2.3		)	(1.9		)
Adjusted net deferred tax liabilities	$	731.6		$	709.0

Change in unrecognized tax benefits

The change in unrecognized tax benefits for the years ended December 31, 2018, 2017, and 2016 was as follows:

	Year Ended December 31,
	2018			2017			2016
	(in millions)
Beginning balance	$	7.0		$	20.7		$	56.9
Additions for tax positions related to the current year	—			—			—
Additions for tax positions of prior years	3.0			4.5			1.0
Reductions for tax positions of prior years	(0.3		)	—			(25.8		)
Settlements	(1.5		)	(17.2		)	(7.1		)
Expiration of statute of limitations	(0.1		)	(1.0		)	(4.3		)
Ending balance	$	8.1		$	7.0		$	20.7