Pension And Other Postretirement Benefit Plans (Components Of Net Periodic Pension Cost) (Detail) (Pension Plans, Defined Benefit, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Plans, Defined Benefit
Pension and Other Postretirement Benefits Disclosure [Line Items]
Service cost, net of employee contributions	$ 6.9	$ 6.8	$ 13.8	$ 13.5
Interest cost	4.9	4.7	9.7	9.4
Expected return on plan assets	(5.9)	(5.9)	(11.7)	(11.7)
Amortization	2.5	2.0	5.0	4.0
Net periodic pension cost	$ 8.4	$ 7.6	$ 16.8	$ 15.2