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Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions | Total | Cumulative Effect Period Of Adoption Adjustment [Member] | Common Stock [Member] | Capital in Excess of Par Value [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Accumulated Other Comprehensive Loss [Member] | Accumulated Other Comprehensive Loss [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 4,569.7 | $ (2.4) | $ 184.0 | $ 3,541.9 | $ 1,558.6 | $ (2.2) | $ (785.6) | $ (0.2) | $ 70.8
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 184,000,000.0 |  |  |  |  |  |
Net earnings | 351.7 |  |  |  | 334.1 |  |  |  | 17.6
Net purchase of subsidiary shares from noncontrolling interests | (0.3) |  |  | (0.2) |  |  |  |  | (0.1)
Dividends paid to noncontrolling interests | (11.0) |  |  |  |  |  |  |  | (11.0)
Net change in pension asset/liability, net of taxes | 1.6 |  |  |  |  |  | 1.6 |  |
Foreign currency translation, net of taxes | 75.1 |  |  |  |  |  | 74.5 |  | 0.6
Change in fair value of derivative investments, net of taxes | (11.8) |  |  |  |  |  | (11.8) |  |
Compensation expense related to stock option plan grants | 3.6 |  |  | 3.6 |  |  |  |  |
Common stock issued in: purchase transactions | 37.0 |  | $ 0.5 | 36.5 |  |  |  |  |
Common stock issued in: purchase transactions (in shares) |  |  | 500,000 |  |  |  |  |  |
Stock option plans | 28.1 |  | $ 0.7 | 27.4 |  |  |  |  |
Stock option plans (in shares) |  |  | 700,000 |  |  |  |  |  |
Employee stock purchase plan | 4.7 |  | $ 0.1 | 4.6 |  |  |  |  |
Employee stock purchase plan (in shares) |  |  | 100,000 |  |  |  |  |  |
Deferred compensation and restricted stock | (7.5) |  |  | (7.5) |  |  |  |  |
Cash dividends declared on common stock | (80.3) |  |  |  | (80.3) |  |  |  |
Ending balance at Mar. 31, 2019 | 4,958.2 |  | $ 185.3 | 3,606.3 | 1,810.2 |  | (721.5) |  | 77.9
Ending balance, (in shares) at Mar. 31, 2019 |  |  | 185,300,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 4,569.7 | $ (2.4) | $ 184.0 | 3,541.9 | 1,558.6 | $ (2.2) | (785.6) | $ (0.2) | 70.8
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 184,000,000.0 |  |  |  |  |  |
Net earnings | 610.2 |  |  |  |  |  |  |  |
Net change in pension asset/liability, net of taxes | 3.4 |  |  |  |  |  |  |  |
Change in fair value of derivative investments, net of taxes | (57.8) |  |  |  |  |  |  |  |
Compensation expense related to stock option plan grants | 10.5 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 4,912.0 |  | $ 186.5 | 3,697.7 | 1,884.2 |  | (925.1) |  | 68.7
Ending balance, (in shares) at Sep. 30, 2019 |  |  | 186,500,000 |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 4,958.2 |  | $ 185.3 | 3,606.3 | 1,810.2 |  | (721.5) |  | 77.9
Beginning balance (in shares) at Mar. 31, 2019 |  |  | 185,300,000 |  |  |  |  |  |
Net earnings | 121.4 |  |  |  | 110.1 |  |  |  | 11.3
Net purchase of subsidiary shares from noncontrolling interests | (7.3) |  |  |  |  |  |  |  | (7.3)
Dividends paid to noncontrolling interests | (13.3) |  |  |  |  |  |  |  | (13.3)
Net change in pension asset/liability, net of taxes | 0.8 |  |  |  |  |  | 0.8 |  |
Foreign currency translation, net of taxes | (60.9) |  |  |  |  |  | (60.7) |  | (0.2)
Change in fair value of derivative investments, net of taxes | (21.1) |  |  |  |  |  | (21.1) |  |
Compensation expense related to stock option plan grants | 3.5 |  |  | 3.5 |  |  |  |  |
Common stock issued in: purchase transactions | 11.0 |  | $ 0.1 | 10.9 |  |  |  |  |
Common stock issued in: purchase transactions (in shares) |  |  | 100,000 |  |  |  |  |  |
Stock option plans | 21.8 |  | $ 0.5 | 21.3 |  |  |  |  |
Stock option plans (in shares) |  |  | 500,000 |  |  |  |  |  |
Employee stock purchase plan | 10.5 |  | $ 0.1 | 10.4 |  |  |  |  |
Employee stock purchase plan (in shares) |  |  | 100,000 |  |  |  |  |  |
Deferred compensation and restricted stock | 4.2 |  | $ 0.1 | 4.1 |  |  |  |  |
Deferred compensation and restricted (in shares) |  |  | 100,000 |  |  |  |  |  |
Cash dividends declared on common stock | (81.0) |  |  |  | (81.0) |  |  |  |
Ending balance at Jun. 30, 2019 | 4,947.8 |  | $ 186.1 | 3,656.5 | 1,839.3 |  | (802.5) |  | 68.4
Ending balance, (in shares) at Jun. 30, 2019 |  |  | 186,100,000 |  |  |  |  |  |
Net earnings | 137.1 |  |  |  | 126.1 |  |  |  | 11.0
Net purchase of subsidiary shares from noncontrolling interests | 0.9 |  |  |  |  |  |  |  | 0.9
Dividends paid to noncontrolling interests | (8.5) |  |  |  |  |  |  |  | (8.5)
Net change in pension asset/liability, net of taxes | 1.0 |  |  |  |  |  | 1.0 |  |
Foreign currency translation, net of taxes | (101.8) |  |  |  |  |  | (98.7) |  | (3.1)
Change in fair value of derivative investments, net of taxes | (24.9) |  |  |  |  |  | (24.9) |  |
Compensation expense related to stock option plan grants | 3.4 |  |  | 3.4 |  |  |  |  |
Common stock issued in: purchase transactions | 9.0 |  | $ 0.1 | 8.9 |  |  |  |  |
Common stock issued in: purchase transactions (in shares) |  |  | 100,000 |  |  |  |  |  |
Stock option plans | 11.8 |  | $ 0.2 | 11.6 |  |  |  |  |
Stock option plans (in shares) |  |  | 200,000 |  |  |  |  |  |
Employee stock purchase plan | 6.2 |  | $ 0.1 | 6.1 |  |  |  |  |
Employee stock purchase plan (in shares) |  |  | 100,000 |  |  |  |  |  |
Deferred compensation and restricted stock | 11.2 |  |  | 11.2 |  |  |  |  |
Cash dividends declared on common stock | (81.2) |  |  |  | (81.2) |  |  |  |
Ending balance at Sep. 30, 2019 | 4,912.0 |  | $ 186.5 | 3,697.7 | 1,884.2 |  | (925.1) |  | 68.7
Ending balance, (in shares) at Sep. 30, 2019 |  |  | 186,500,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ 5,215.5 |  | $ 188.1 | 3,825.7 | 1,901.3 |  | (759.6) |  | 60.0
Beginning balance (in shares) at Dec. 31, 2019 | 188,100,000 |  | 188,100,000 |  |  |  |  |  |
Net earnings | $ 355.4 |  |  |  | 346.3 |  |  |  | 9.1
Net purchase of subsidiary shares from noncontrolling interests | (10.8) |  |  |  |  |  |  |  | (10.8)
Dividends paid to noncontrolling interests | (18.9) |  |  |  |  |  |  |  | (18.9)
Net change in pension asset/liability, net of taxes | 1.2 |  |  |  |  |  | 1.2 |  |
Foreign currency translation, net of taxes | (380.1) |  |  |  |  |  | (381.3) |  | 1.2
Change in fair value of derivative investments, net of taxes | (91.4) |  |  |  |  |  | (91.4) |  |
Compensation expense related to stock option plan grants | 3.4 |  |  | 3.4 |  |  |  |  |
Common stock issued in: purchase transactions | 73.1 |  | $ 0.7 | 72.4 |  |  |  |  |
Common stock issued in: purchase transactions (in shares) |  |  | 700,000 |  |  |  |  |  |
Stock option plans | 17.9 |  | $ 0.4 | 17.5 |  |  |  |  |
Stock option plans (in shares) |  |  | 400,000 |  |  |  |  |  |
Employee stock purchase plan | 6.0 |  | $ 0.1 | 5.9 |  |  |  |  |
Employee stock purchase plan (in shares) |  |  | 100,000 |  |  |  |  |  |
Deferred compensation and restricted stock | (15.0) |  | $ 0.3 | (15.3) |  |  |  |  |
Deferred compensation and restricted (in shares) |  |  | 300,000 |  |  |  |  |  |
Cash dividends declared on common stock | (86.2) |  |  |  | (86.2) |  |  |  |
Ending balance at Mar. 31, 2020 | 5,070.1 |  | $ 189.6 | 3,909.6 | 2,161.4 |  | (1,231.1) |  | 40.6
Ending balance, (in shares) at Mar. 31, 2020 |  |  | 189,600,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ 5,215.5 |  | $ 188.1 | 3,825.7 | 1,901.3 |  | (759.6) |  | 60.0
Beginning balance (in shares) at Dec. 31, 2019 | 188,100,000 |  | 188,100,000 |  |  |  |  |  |
Net earnings | $ 705.0 |  |  |  |  |  |  |  |
Net change in pension asset/liability, net of taxes | 1.6 |  |  |  |  |  |  |  |
Change in fair value of derivative investments, net of taxes | (83.7) |  |  |  |  |  |  |  |
Compensation expense related to stock option plan grants | $ 10.1 |  |  |  |  |  |  |  |
Stock option plans (in shares) | 1,200,000 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 5,818.2 |  | $ 192.3 | 4,132.5 | 2,317.3 |  | (870.4) |  | 46.5
Ending balance, (in shares) at Sep. 30, 2020 | 192,300,000 |  | 192,300,000 |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | $ 5,070.1 |  | $ 189.6 | 3,909.6 | 2,161.4 |  | (1,231.1) |  | 40.6
Beginning balance (in shares) at Mar. 31, 2020 |  |  | 189,600,000 |  |  |  |  |  |
Net earnings | 161.8 |  |  |  | 153.7 |  |  |  | 8.1
Net purchase of subsidiary shares from noncontrolling interests | 4.3 |  |  |  |  |  |  |  | 4.3
Dividends paid to noncontrolling interests | (6.3) |  |  |  |  |  |  |  | (6.3)
Foreign currency translation, net of taxes | 249.9 |  |  |  |  |  | 250.7 |  | (0.8)
Change in fair value of derivative investments, net of taxes | (1.8) |  |  |  |  |  | (1.8) |  |
Compensation expense related to stock option plan grants | 3.3 |  |  | 3.3 |  |  |  |  |
Common stock issued in: purchase transactions | 110.9 |  | $ 1.2 | 109.7 |  |  |  |  |
Common stock issued in: purchase transactions (in shares) |  |  | 1,200,000 |  |  |  |  |  |
Stock option plans | 21.9 |  | $ 0.5 | 21.4 |  |  |  |  |
Stock option plans (in shares) |  |  | 500,000 |  |  |  |  |  |
Employee stock purchase plan | 12.4 |  | $ 0.1 | 12.3 |  |  |  |  |
Employee stock purchase plan (in shares) |  |  | 100,000 |  |  |  |  |  |
Deferred compensation and restricted stock | (5.2) |  | $ 0.1 | (5.3) |  |  |  |  |
Deferred compensation and restricted (in shares) |  |  | 100,000 |  |  |  |  |  |
Cash dividends declared on common stock | (86.8) |  |  |  | (86.8) |  |  |  |
Ending balance at Jun. 30, 2020 | 5,534.5 |  | $ 191.5 | 4,051.0 | 2,228.3 |  | (982.2) |  | 45.9
Ending balance, (in shares) at Jun. 30, 2020 |  |  | 191,500,000 |  |  |  |  |  |
Net earnings | 187.8 |  |  |  | 176.6 |  |  |  | 11.2
Net purchase of subsidiary shares from noncontrolling interests | (0.8) |  |  |  |  |  |  |  | (0.8)
Dividends paid to noncontrolling interests | (10.3) |  |  |  |  |  |  |  | (10.3)
Net change in pension asset/liability, net of taxes | 0.4 |  |  |  |  |  | 0.4 |  |
Foreign currency translation, net of taxes | 102.4 |  |  |  |  |  | 101.9 |  | 0.5
Change in fair value of derivative investments, net of taxes | 9.5 |  |  |  |  |  | 9.5 |  |
Compensation expense related to stock option plan grants | 3.4 |  |  | 3.4 |  |  |  |  |
Common stock issued in: purchase transactions | 39.0 |  | $ 0.4 | 38.6 |  |  |  |  |
Common stock issued in: purchase transactions (in shares) |  |  | 400,000 |  |  |  |  |  |
Stock option plans | 17.2 |  | $ 0.3 | 16.9 |  |  |  |  |
Stock option plans (in shares) |  |  | 300,000 |  |  |  |  |  |
Employee stock purchase plan | 8.1 |  | $ 0.1 | 8.0 |  |  |  |  |
Employee stock purchase plan (in shares) |  |  | 100,000 |  |  |  |  |  |
Deferred compensation and restricted stock | 14.6 |  |  | 14.6 |  |  |  |  |
Cash dividends declared on common stock | (87.6) |  |  |  | (87.6) |  |  |  |
Ending balance at Sep. 30, 2020 | $ 5,818.2 |  | $ 192.3 | $ 4,132.5 | $ 2,317.3 |  | $ (870.4) |  | $ 46.5
Ending balance, (in shares) at Sep. 30, 2020 | 192,300,000 |  | 192,300,000 |  |  |  |  |  |

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