Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The following summarizes pretax income:

	2019		2018		2017
U.S.	$	552.4	$	655.0	$	426.6
International	110.7		101.2		108.0
Total (before equity earnings)	$	663.1	$	756.2	$	534.6

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The tax provision contains the following components:

	2019			2018			2017
Current
Federal	$	57.8		$	159.4		$	107.3
State	0.7			4.1			0.7
Foreign	(12.8		)	11.4			20.0
Total current	$	45.7		$	174.9		$	128.0
Deferred
Federal	$	71.8		$	(27.8	)	$	53.6
State	(11.4		)	(12.8		)	(0.2		)
Foreign	26.7			5.5			(1.4		)
Total deferred	87.1			(35.1		)	52.0
Total income tax provision	$	132.8		$	139.8		$	180.0

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2019					2018					2017
Tax at U.S. Federal statutory rate	$	139.3		21.0	%	$	158.8		21.0	%	$	187.1		35.0	%
State income taxes, net of Federal benefit	14.9			2.3		18.1			2.4		8.8			1.6
State income tax credits, net of Federal benefit	(22.6		)	(3.4	)	(22.7		)	(3.0	)	(9.7		)	(1.8	)
Foreign rate differences	(7.1		)	(1.1	)	(6.2		)	(0.8	)	(20.6		)	(3.8	)
Research and experimentation	0.7			0.1		(5.4		)	(0.7	)	(2.6		)	(0.5	)
Domestic Production Activities Deduction	—			—		—			—		(7.1		)	(1.3	)
Interest on assessments	—			—		—			—		(0.1		)	—
Excess tax benefits	(2.5		)	(0.4	)	(4.0		)	(0.5	)	(4.8		)	(0.9	)
Non-deductible expenses	4.0			0.6		4.6			0.6		2.4			0.5
Transition tax	1.6			0.2		(5.4		)	(0.7	)	44.9			8.4
Re-measurement of Deferred Taxes	(2.0		)	(0.3	)	—			—		(16.2		)	(3.0	)
Global Intangible Low-Taxed Income (GILTI) Tax	7.1			1.1		1.8			0.2		—			—
Other	(0.6		)	(0.1	)	0.2			—		(2.1		)	(0.5	)
Total income tax provision	$	132.8		20.0	%	$	139.8		18.5	%	$	180.0		33.7	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2019			2018
Long-term contracts	$	107.5		$	210.2
Post-retirement benefits other than pensions	9.8			9.5
Pension and other employee benefit plans	(88.5		)	(60.4		)
Employee compensation accruals	39.2			36.1
Depreciation and amortization	(117.8		)	(115.1		)
Inventory	0.4			0.5
State income tax credits	108.3			94.1
Accruals and reserves	40.3			46.2
Deferred production	—			(1.8		)
Net operating loss carryforward	0.4			0.4
Interest swap contract	0.2			—
Other	8.6			(2.3		)
Net deferred tax asset	108.4			217.4
Valuation allowance	(10.2		)	(13.2		)
Net deferred tax asset	98.2			204.2

Unrecognized Tax Benefits reconciliation Table

	2019			2018		2017
Beginning balance at January 1	$	7.2		$	6.7	$	6.3
Gross increases related to current period tax positions	0.4			—		—
Gross increases related to prior period tax positions	—			0.5		0.4
Gross decreases related to prior period tax positions	(2.2		)	—		—
Statute of limitations' expiration	—			—		—
Settlements	—			—		—
Ending balance at December 31	$	5.4		$	7.2	$	6.7