Changes In Equity And Comprehensive Income (Summary Of Changes In Equity) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			$ 1,070.6	$ 1,214.7
Dividends			57.4	54.8
Reacquisition on open market			25.0	0.0
Exercise of stock options, net of shares reacquired			7.3	8.7
Stock compensation expense			15.7	15.9
Excess tax benefit from stock based compensation			(0.2)	7.9
Net income	$ 57.2	$ 28.2	164.4	137.0
Other comprehensive income (loss)	(24.6)	(69.3)	(64.9)	(57.6)
Comprehensive income	32.6	(41.1)	99.5	79.4
Balance, end of period	1,110.4	1,271.8	1,110.4	1,271.8
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			1,059.8	1,204.3
Dividends			(57.4)	(54.8)
Reacquisition on open market			(25.0)	0.0
Exercise of stock options, net of shares reacquired			7.3	8.7
Stock compensation expense			15.7	15.9
Excess tax benefit from stock based compensation			(0.2)	7.9
Net income			163.7	136.5
Other comprehensive income (loss)			(64.5)	(57.5)
Comprehensive income			99.2	78.9
Balance, end of period	1,099.3	1,261.1	1,099.3	1,261.1
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			10.8	10.4
Net income			0.7	0.5
Other comprehensive income (loss)			(0.4)	(0.1)
Comprehensive income				0.4
Balance, end of period	$ 11.1	$ 10.8	$ 11.1	$ 10.8