Pension And Other Postretirement Benefit Plans (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plans contribution by the company			$ 17.0
Defined benefit plans contribution by the company		$ 15.2		$ 24.5
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plans contribution by the company			$ 1.0
Defined benefit plans contribution by the company	$ 0.2			$ 1.0