Income Taxes (Tables)

9 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Combined Federal And State Effective Income Tax Rates Table Textblock

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Combined federal and state effective income tax rates	31.9	%	32.2	%	29.0	%	30.7	%

Tax-Advantaged amounts recorded in income taxes table

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2015		2014		2015		2014
		(In millions)
Tax credits		$	(7.0)	$	(7.6)	$	(25.0)	$	(21.3)
Benefits from tax losses			(2.0)		(2.0)		(6.0)		(5.5)
Amortization of tax-advantaged investments			6.7		7.2		22.8		19.6
	Total amounts recorded in income taxes	$	(2.3)	$	(2.4)	$	(8.2)	$	(7.2)