Pension And Other Postretirement Benefit Plans (Components Of Net Periodic Cost) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.4	$ 1.3
Interest cost	9.6	10.2
Expected return on plan assets	(15.6)	(15.7)
Amortization of prior service cost	0	0
Amortization of net loss (gain)	3.1	1.3
Net periodic cost	(1.5)	(2.9)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	0.1	0.1
Amortization of prior service cost	(0.1)	(0.1)
Amortization of net loss (gain)	(0.1)	0
Net periodic cost	$ (0.1)	$ 0