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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 1,593.0	$ 1,527.1	$ 1,448.1	$ 1,348.5	$ 1,527.1	$ 1,348.5
Net income	91.0	82.5	80.7	68.7	173.5	149.4
Net Income (Loss) Attributable to Noncontrolling Interest	0.0		0.0		(0.1)	0.0
Cash dividends	(23.3)	(23.4)	(20.9)	(20.9)
Impact from settlement of share-based awards, net of shares acquired	1.5	(0.2)	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	5.6	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	1.9	2.9	4.5	9.6	4.8	14.1
Currency translation adjustment	4.7	(0.9)	(46.9)	25.4
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0.0		(0.2)		(0.1)	(0.2)
Balance, end of period	$ 1,674.4	$ 1,593.0	$ 1,446.6	$ 1,448.1	$ 1,674.4	$ 1,446.6
Dividends per share (in dollars per share)	$ 0.39	$ 0.39	$ 0.35	$ 0.35	$ 0.78	$ 0.70
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	72.4	72.4		72.4	72.4	72.4
Ending balance	72.4	72.4			72.4
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 299.2	$ 303.5	$ 287.6	$ 291.7	$ 303.5	$ 291.7
Impact from settlement of share-based awards, net of shares acquired	(0.7)	(9.8)	0.0	(9.7)
Stock-based compensation expense	5.6	5.5	5.6	5.6
Balance, end of period	304.1	299.2	293.2	287.6	304.1	293.2
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	2,131.1	2,072.1	1,867.8	1,813.3	2,072.1	1,813.3
Net income	91.0	82.4	80.7	68.7
Cash dividends	(23.3)	(23.4)	(20.9)	(20.9)
Cumulative effect of adoption ASC 606							6.7
Balance, end of period	2,198.8	2,131.1	1,927.6	1,867.8	2,198.8	1,927.6
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(445.5)	(447.6)	(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	1.9	2.9	4.5	9.6
Currency translation adjustment	4.7	(0.8)	(46.7)	25.4
Balance, end of period	(438.9)	(445.5)	(387.3)	(345.1)	(438.9)	(387.3)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(466.6)	(476.2)	(437.9)	(452.1)	(476.2)	(452.1)
Impact from settlement of share-based awards, net of shares acquired	2.2	9.6	0.5	14.2
Stock Repurchased and Retired During Period, Value			(25.0)
Balance, end of period	(464.4)	(466.6)	(462.4)	(437.9)	(464.4)	(462.4)
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	1,590.6	1,524.2	1,444.8	1,345.2	1,524.2	1,345.2
Net income	91.0	82.4	80.7	68.7
Cash dividends	(23.3)	(23.4)	(20.9)	(20.9)
Impact from settlement of share-based awards, net of shares acquired	1.5	(0.2)	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	5.6	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	1.9	2.9	4.5	9.6
Currency translation adjustment	4.7	(0.8)	(46.7)	25.4
Balance, end of period	1,672.0	1,590.6	1,443.5	1,444.8	1,672.0	1,443.5
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	2.4	2.9	3.3	3.3	2.9	3.3
Net Income (Loss) Attributable to Noncontrolling Interest		0.1
Deconsolidation of a joint venture		(0.5)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest		0.1	(0.2)
Balance, end of period	$ 2.4	$ 2.4	$ 3.1	$ 3.3	$ 2.4	$ 3.1
Common Shares Issued At Par Value [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			72.4
Ending balance			72.4	72.4		72.4