Pension And Other Postretirement Benefit Plans (Components Of Net Periodic Cost) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	$ 4.4		$ 4.4
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.4	$ 1.3	4.0	$ 3.8
Interest cost	9.5	10.2	28.6	30.7
Expected return on plan assets	(15.7)	(15.7)	(46.9)	(47.1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.1)	0.0	(0.2)	0.1
Amortization of net loss (gain)	3.1	1.3	9.3	3.8
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	4.4		4.4
Net periodic cost	(6.2)	(2.9)	(9.6)	(8.8)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.1
Interest cost	0.1	0.1	0.3	0.3
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)	(0.2)	(0.2)
Amortization of net loss (gain)	0.0	0.0	(0.2)	(0.1)
Net periodic cost	$ 0.0	$ 0.0	$ (0.1)	$ 0.0