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Changes In Equity And Accumulated Other Comprehensive Loss (Summary Of Changes In Equity) (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Changes In Equity And Comprehensive Income [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ 14.8 | $ 62.8 | $ 91.0 |  | $ 77.6 | $ 173.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,407.5 | 1,476.3 | 1,593.0 | $ 1,527.1 | 1,476.3 | 1,527.1
Net income | 14.8 | 62.8 | 91.0 | 82.5 | 77.6 | 173.5
Net Income (Loss) Attributable to Noncontrolling Interest | 0.0 |  | 0.0 |  | 0.0 | (0.1)
Cash dividends | (24.9) | (25.5) | (23.3) | (23.4) |  |
Stock-based compensation expense | 4.7 | 5.8 | 5.6 | 5.5 |  |
Deconsolidation of a joint venture |  |  |  | (0.5) |  |
Changes in pension and postretirement plan assets and benefit obligation, net of tax | 3.6 | 3.6 | 1.9 | 2.9 | 7.1 | 4.8
Currency translation adjustment | 17.4 | (45.5) | 4.7 | (0.9) |  |
Balance, end of period | 1,423.6 | 1,407.5 | 1,674.4 | 1,593.0 | $ 1,423.6 | $ 1,674.4
Impact from settlement of share-based awards, net of shares acquired | $ 0.5 | 0.0 | $ 1.5 | $ (0.2) |  |
Stock Repurchased During Period, Value |  | $ (70.0) |  |  |  |
Dividends per share (in dollars per share) | $ 0.43 | $ 0.43 | $ 0.39 | $ 0.39 | $ 0.86 | $ 0.78
Common Shares Issued At Par Value [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | $ 72.4 | $ 72.4 | $ 72.4 | $ 72.4 | $ 72.4 | $ 72.4
Balance, end of period | 72.4 | 72.4 | 72.4 | 72.4 | 72.4 | 72.4
Additional Paid-in Capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 315.4 | 315.6 | 299.2 | 303.5 | 315.6 | 303.5
Stock-based compensation expense | 4.7 | 5.8 | 5.6 | 5.5 |  |
Balance, end of period | 318.7 | 315.4 | 304.1 | 299.2 | 318.7 | 304.1
Impact from settlement of share-based awards, net of shares acquired | (1.4) | (6.0) | (0.7) | (9.8) |  |
Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 2,149.5 | 2,112.2 | 2,131.1 | 2,072.1 | 2,112.2 | 2,072.1
Net income |  |  | 91.0 | 82.4 |  |
Cash dividends | (24.9) | (25.5) | (23.3) | (23.4) |  |
Balance, end of period | 2,139.4 | 2,149.5 | 2,198.8 | 2,131.1 | 2,139.4 | 2,198.8
AOCI Attributable to Parent |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (525.3) | (483.7) | (445.5) | (447.6) | (483.7) | (447.6)
Changes in pension and postretirement plan assets and benefit obligation, net of tax | 3.6 | 3.6 | 1.9 | 2.9 |  |
Currency translation adjustment | 17.2 | (45.2) | 4.7 | (0.8) |  |
Balance, end of period | (504.5) | (525.3) | (438.9) | (445.5) | (504.5) | (438.9)
Treasury Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (606.8) | (542.8) | (466.6) | (476.2) | (542.8) | (476.2)
Balance, end of period | (604.9) | (606.8) | (464.4) | (466.6) | (604.9) | (464.4)
Impact from settlement of share-based awards, net of shares acquired | 1.9 | 6.0 | 2.2 | 9.6 |  |
Stock Repurchased During Period, Value |  | (70.0) |  |  |  |
Parent |  |  |  |  |  |
Changes In Equity And Comprehensive Income [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 14.8 | 62.8 | 91.0 | 82.4 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,405.2 | 1,473.7 | 1,590.6 | 1,524.2 | 1,473.7 | 1,524.2
Cash dividends | (24.9) | (25.5) | (23.3) | (23.4) |  |
Stock-based compensation expense | 4.7 | 5.8 | 5.6 | 5.5 |  |
Changes in pension and postretirement plan assets and benefit obligation, net of tax | 3.6 | 3.6 | 1.9 | 2.9 |  |
Currency translation adjustment | 17.2 | (45.2) | 4.7 | (0.8) |  |
Balance, end of period | 1,421.1 | 1,405.2 | 1,672.0 | 1,590.6 | 1,421.1 | 1,672.0
Impact from settlement of share-based awards, net of shares acquired | 0.5 | 0.0 | 1.5 | (0.2) |  |
Stock Repurchased During Period, Value |  | (70.0) |  |  |  |
Noncontrolling Interest |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 2.3 | 2.6 | 2.4 | 2.9 | 2.6 | 2.9
Net Income (Loss) Attributable to Noncontrolling Interest | 0.0 | 0.0 | 0.0 | (0.1) |  |
Deconsolidation of a joint venture |  |  |  | (0.5) |  |
Currency translation adjustment | 0.2 | (0.3) | 0.0 | (0.1) |  |
Balance, end of period | $ 2.5 | $ 2.3 | $ 2.4 | $ 2.4 | $ 2.5 | $ 2.4

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