Changes In Equity And Accumulated Other Comprehensive Loss (Summary Of Changes In Equity) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 1,674.4	$ 1,593.0	$ 1,527.1	$ 1,446.6	$ 1,448.1	$ 1,348.5	$ 1,527.1	$ 1,348.5
Net income	72.6	91.0	82.5	97.1	80.7	68.7	246.1	246.4
Net Income (Loss) Attributable to Noncontrolling Interest	(0.1)			(0.1)			(0.2)	0.0
Cash dividends	(23.4)	(23.3)	(23.4)	(20.9)	(20.9)	(20.9)
Impact from settlement of share-based awards, net of shares acquired	1.4	1.5	(0.2)	4.9	0.5	4.5
Cumulative effect of adoption ASC 606									$ 6.7
Stock Repurchased and Retired During Period, Value					(25.0)
Stock-based compensation expense	5.7	5.6	5.5		5.6	5.6
Deconsolidation of a joint venture			(0.5)
Changes in pension and postretirement plan assets and benefit obligation, net of tax	3.0	1.9	2.9	2.7	4.5	9.6	7.8	16.8
Currency translation adjustment	(33.7)	4.7	(0.9)	(8.5)	(46.9)	25.4
Balance, end of period	$ 1,700.0	$ 1,674.4	$ 1,593.0	$ 1,529.5	$ 1,446.6	$ 1,448.1	$ 1,700.0	$ 1,529.5
Dividends per share (in dollars per share)	$ 0.39	$ 0.39	$ 0.39	$ 0.35	$ 0.35	$ 0.35	$ 1.17	$ 1.05
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	72.4	72.4	72.4			72.4	72.4	72.4
Ending balance (in shares)	72.4	72.4	72.4				72.4
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 304.1	$ 299.2	$ 303.5	$ 293.2	$ 287.6	$ 291.7	$ 303.5	$ 291.7
Impact from settlement of share-based awards, net of shares acquired	0.3	(0.7)	(9.8)		0.0	(9.7)
Stock-based compensation expense	5.7	5.6	5.5	4.9	5.6	5.6
Balance, end of period	310.1	304.1	299.2	298.1	293.2	287.6	310.1	298.1
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	2,198.8	2,131.1	2,072.1	1,927.6	1,867.8	1,813.3	2,072.1	1,813.3
Net income	72.5	91.0	82.4	97.0	80.7	68.7
Cash dividends	(23.4)	(23.3)	(23.4)	(20.9)	(20.9)	(20.9)
Cumulative effect of adoption ASC 606									6.7
Balance, end of period	2,247.9	2,198.8	2,131.1	2,003.7	1,927.6	1,867.8	2,247.9	2,003.7
AOCI Attributable to Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(438.9)	(445.5)	(447.6)	(387.3)	(345.1)	(380.1)	(447.6)	(380.1)
Deconsolidation of a joint venture			0.0
Changes in pension and postretirement plan assets and benefit obligation, net of tax	3.0	1.9	2.9	2.7	4.5	9.6
Currency translation adjustment	(33.7)	4.7	(0.8)	(8.4)	(46.7)	25.4
Balance, end of period	(469.6)	(438.9)	(445.5)	(393.0)	(387.3)	(345.1)	(469.6)	(393.0)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(464.4)	(466.6)	(476.2)	(462.4)	(437.9)	(452.1)	(476.2)	(452.1)
Impact from settlement of share-based awards, net of shares acquired	1.1	2.2	9.6	7.6	0.5	14.2
Stock Repurchased and Retired During Period, Value					(25.0)
Balance, end of period	(463.3)	(464.4)	(466.6)	(454.8)	(462.4)	(437.9)	(463.3)	(454.8)
Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	1,672.0	1,590.6	1,524.2	1,443.5	1,444.8	1,345.2	1,524.2	1,345.2
Net income	72.5	91.0	82.4	97.0	80.7	68.7
Cash dividends	(23.4)	(23.3)	(23.4)	(20.9)	(20.9)	(20.9)
Impact from settlement of share-based awards, net of shares acquired	1.4	1.5	(0.2)	4.9	0.5	4.5
Cumulative effect of adoption ASC 606									$ 6.7
Stock Repurchased and Retired During Period, Value					(25.0)
Stock-based compensation expense	5.7	5.6	5.5		5.6	5.6
Deconsolidation of a joint venture			0.0
Changes in pension and postretirement plan assets and benefit obligation, net of tax	3.0	1.9	2.9	2.7	4.5	9.6
Currency translation adjustment	(33.7)	4.7	(0.8)	(8.4)	(46.7)	25.4
Balance, end of period	1,697.5	1,672.0	1,590.6	1,526.4	1,443.5	1,444.8	1,697.5	1,526.4
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	2.4	2.4	2.9	3.1	3.3	3.3	2.9	3.3
Net Income (Loss) Attributable to Noncontrolling Interest	0.1		0.1
Deconsolidation of a joint venture			(0.5)
Currency translation adjustment			(0.1)	(0.1)	(0.2)
Balance, end of period	$ 2.5	$ 2.4	$ 2.4	$ 3.1	$ 3.1	$ 3.3	$ 2.5	$ 3.1
Common Shares Issued At Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)				72.4	72.4
Ending balance (in shares)				72.4	72.4	72.4		72.4

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