Changes In Equity And Comprehensive Income (Summary Of Changes In Equity) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 1,070,600,000	$ 1,214,700,000
Dividends	(19,100,000)	(17,600,000)
Reacquisition on open market	(25,000,000)	0
Exercise of stock options, net of shares reacquired	6,700,000	3,800,000
Stock compensation expense	5,800,000	5,600,000
Excess tax benefit from stock based compensation	900,000	5,100,000
Net income	51,300,000	48,900,000
Other comprehensive income (loss)	(68,900,000)	(1,000,000)
Comprehensive income	(17,600,000)	47,800,000
Balance, end of period	1,022,300,000	1,259,400,000
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	1,059,800,000	1,204,300,000
Dividends	(19,100,000)	(17,600,000)
Reacquisition on open market	(25,000,000)	0
Exercise of stock options, net of shares reacquired	6,700,000	3,800,000
Stock compensation expense	5,800,000	5,600,000
Excess tax benefit from stock based compensation	900,000	5,100,000
Net income	51,100,000	48,700,000
Other comprehensive income (loss)	(68,700,000)	(1,000,000)
Comprehensive income	(17,700,000)	47,700,000
Balance, end of period	1,011,400,000	1,248,900,000
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	10,800,000	10,354,000
Net income	300,000	188,000
Other comprehensive income (loss)	(200,000)	(25,000)
Comprehensive income	100,000	163,000
Balance, end of period	$ 10,900,000	$ 10,517,000