Pension And Other Postretirement Benefit Plans (Components Of Net Periodic Cost) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.2	$ 1.3	$ 2.7	$ 2.5
Interest cost	9.4	10.2	19.0	20.5
Expected return on plan assets	(15.4)	(15.7)	(31.2)	(31.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.2)	0.0	(0.1)	0.1
Amortization of net loss (gain)	3.1	1.3	6.2	2.5
Net periodic cost	(1.9)	(2.9)	(3.4)	(5.9)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.1	0.1	0.2	0.2
Expected return on plan assets	0.0	0.0	0.0	0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.1)	(0.1)	(0.1)	(0.1)
Amortization of net loss (gain)	(0.1)	(0.1)	(0.3)	(0.1)
Net periodic cost	$ (0.1)	$ 0.0	$ (0.2)	$ 0.0