Retirement Benefits (Tables)

3 Months Ended

Sep. 30, 2012

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income for Pension Benefits

						Three Months Ended				Nine Months Ended
						September 30,				September 30,
						2012		2011		2012		2011
						(In millions)
Components of net periodic benefit cost:
		Service cost				$	2.5	$	2.4	$	7.4	$	7.4
		Interest cost					4.1		4.5		12.4		13.6
		Expected return on plan assets					(6.6)		(5.6)		(19.9)		(16.8)
		Amortization of prior service cost					0.2		0.2		0.5		0.5
		Amortization of net actuarial loss					2.1		1.0		6.5		2.9
			Net periodic benefit cost				2.3		2.5		6.9		7.6
Other changes in plan assets and benefit obligation recognized
	in other comprehensive income:
		Amortization of prior service cost					(0.2)		(0.2)		(0.5)		(0.5)
		Amortization of net actuarial loss					(2.1)		(1.0)		(6.5)		(2.9)
			Total recognized in other comprehensive income				(2.3)		(1.2)		(7.0)		(3.4)
				Total recognized in net periodic benefit cost and other
					comprehensive income	$	0.0	$	1.3	$	(0.1)	$	4.2

Components of Net Periodic Benefit Cost (Benefit) and Other Amounts Recognized in Other Comprehensive Income for Postretirement Benefits

						Three Months Ended				Nine Months Ended
						September 30,				September 30,
						2012		2011		2012		2011
						(In millions)
Components of net periodic benefit cost:
		Service cost				$	0.3	$	0.4	$	0.7	$	0.8
		Interest cost					0.4		0.6		1.3		1.6
		Expected return on plan assets					(0.2)		(0.2)		(0.6)		(0.6)
		Amortization of prior service credit					(0.1)		(0.1)		(0.3)		(0.2)
			Net periodic benefit cost				0.4		0.7		1.1		1.6
Other changes in plan assets and benefit obligation recognized in
	other comprehensive income:
		Net gain					0.0		0.0		(0.7)		(2.3)
		Amortization of prior service cost					0.1		0.1		0.3		0.2
			Total recognized in other comprehensive income				0.1		0.1		(0.4)		(2.1)
				Total recognized in net periodic benefit cost
					and other comprehensive income	$	0.5	$	0.8	$	0.7	$	(0.5)