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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Paid-In Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Loss | Noncontrolling Interests | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2018 |  | 185.7 |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | $ 1.9 | $ 1,947.3 | $ (139.9) | $ 363.1 | $ (282.7) | $ 92.5 | $ 1,982.2
Net Income (Loss) Attributable to Parent |  |  |  |  | 70.9 |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | 2.4 |
Net income (loss) |  |  |  |  |  |  |  | 73.4
Other comprehensive income |  |  |  |  |  | 53.2 | 0.1 | 53.3
Stock-based compensation |  |  | 9.2 |  |  |  |  | 9.2
Employee share purchase plan |  | 0.1 |  |  |  |  |  |
Employee share purchase plan |  | $ 0.0 | 6.9 |  |  |  |  | 6.9
Exercise of stock options |  | 0.5 |  |  |  |  |  |
Exercise of stock options |  | $ 0.0 | 4.2 |  |  |  |  | 4.2
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  | $ 0.0 |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 1.6 |  |  |  |  |  |
Treasury stock purchased |  | (0.6) |  |  |  |  |  |
Treasury stock purchased |  |  |  | (37.1) |  |  |  | (37.1)
Dividends to shareholders |  |  |  |  | (14.2) |  |  | (14.2)
Balance (in shares) at Mar. 31, 2019 |  | 187.3 |  |  |  |  |  |
Balance at Mar. 31, 2019 |  | $ 1.9 | 1,967.6 | (177.0) | 418.8 | (229.4) | 95.0 | 2,076.9
Balance (in shares) at Dec. 31, 2018 |  | 185.7 |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | $ 1.9 | 1,947.3 | (139.9) | 363.1 | (282.7) | 92.5 | 1,982.2
Net Income (Loss) Attributable to Parent | $ 264.1 |  |  |  |  |  |  |
Net income (loss) | 265.6 |  |  |  |  |  |  |
Other comprehensive income | (87.7) |  |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2019 |  | 188.3 |  |  |  |  |  |
Balance at Sep. 30, 2019 |  | $ 1.9 | 1,999.7 | (177.9) | 583.4 | (369.7) | 92.1 | 2,129.5
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2017-12 [Member] |  |  |  |  | (1.0) |  |  | (1.0)
Balance (in shares) at Mar. 31, 2019 |  | 187.3 |  |  |  |  |  |
Balance at Mar. 31, 2019 |  | $ 1.9 | 1,967.6 | (177.0) | 418.8 | (229.4) | 95.0 | 2,076.9
Net Income (Loss) Attributable to Parent |  |  |  |  | 101.5 |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | 2.5 |
Net income (loss) |  |  |  |  |  |  |  | 104.0
Other comprehensive income |  |  |  |  |  | (66.8) | 0.7 | (66.1)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |  |  | (0.8) | (0.8)
Stock-based compensation |  |  | 6.1 |  |  |  |  | 6.1
Exercise of stock options |  | 0.5 |  |  |  |  |  |
Exercise of stock options |  | $ 0.0 | 2.7 |  |  |  |  | 2.7
Treasury stock purchased |  | 0.0 |  |  |  |  |  |
Treasury stock purchased |  |  |  | (0.1) |  |  |  | (0.1)
Dividends to shareholders |  |  |  |  | (14.2) |  |  | (14.2)
Balance (in shares) at Jun. 30, 2019 |  | 187.8 |  |  |  |  |  |
Balance at Jun. 30, 2019 |  | $ 1.9 | 1,976.4 | (177.1) | 506.1 | (296.2) | 97.4 | 2,108.5
Net Income (Loss) Attributable to Parent | 91.7 |  |  |  | 91.7 |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | (3.4) |
Net income (loss) | 88.3 |  |  |  |  |  |  | 88.3
Other comprehensive income | (74.9) |  |  |  |  | (73.5) | (1.4) | (74.9)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |  |  | (0.5) | (0.5)
Stock-based compensation |  |  | 12.4 |  |  |  |  | 12.4
Employee share purchase plan |  | 0.1 |  |  |  |  |  |
Employee share purchase plan |  | $ 0.0 | 8.3 |  |  |  |  | 8.3
Exercise of stock options |  | 0.4 |  |  |  |  |  |
Exercise of stock options |  | $ 0.0 | 2.6 |  |  |  |  | 2.6
Treasury stock purchased |  | 0.0 |  |  |  |  |  |
Treasury stock purchased |  |  |  | (0.8) |  |  |  | (0.8)
Dividends to shareholders |  |  |  |  | (14.3) |  |  | (14.3)
Stockholders' Equity, Other |  |  |  |  | 0.1 |  |  | 0.1
Balance (in shares) at Sep. 30, 2019 |  | 188.3 |  |  |  |  |  |
Balance at Sep. 30, 2019 |  | $ 1.9 | 1,999.7 | (177.9) | 583.4 | (369.7) | 92.1 | 2,129.5
Balance (in shares) at Dec. 31, 2019 |  | 188.7 |  |  |  |  |  |
Balance at Dec. 31, 2019 | 2,339.4 | $ 1.9 | 2,022.3 | (179.2) | 652.0 | (251.6) | 94.0 | 2,339.4
Net Income (Loss) Attributable to Parent |  |  |  |  | 70.2 |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | 4.1 |
Net income (loss) |  |  |  |  |  |  |  | 74.3
Other comprehensive income |  |  |  |  |  | (216.6) | (1.7) | (218.3)
Stock-based compensation |  |  | 4.1 |  |  |  |  | 4.1
Employee share purchase plan |  | 0.1 |  |  |  |  |  |
Employee share purchase plan |  | $ 0.0 | 8.9 |  |  |  |  | 8.9
Exercise of stock options |  | 0.4 |  |  |  |  |  |
Exercise of stock options |  | $ 0.0 | 2.8 |  |  |  |  | 2.8
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  | $ 0.0 |  |  |  |  |  |
Vesting of restricted stock units |  | 0.9 |  |  |  |  |  |
Treasury stock purchased |  | (0.3) |  |  |  |  |  |
Treasury stock purchased |  |  |  | (32.6) |  |  |  | (32.6)
Dividends to shareholders |  |  |  |  | (14.4) |  |  | (14.4)
Stockholders' Equity, Other |  |  |  |  | (0.1) |  | 0.1 | 0.0
Balance (in shares) at Mar. 31, 2020 |  | 189.8 |  |  |  |  |  |
Balance at Mar. 31, 2020 |  | $ 1.9 | 2,038.1 | (211.8) | 707.7 | (468.2) | 96.5 | 2,164.2
Balance (in shares) at Dec. 31, 2019 |  | 188.7 |  |  |  |  |  |
Balance at Dec. 31, 2019 | 2,339.4 | $ 1.9 | 2,022.3 | (179.2) | 652.0 | (251.6) | 94.0 | 2,339.4
Net Income (Loss) Attributable to Parent | 241.5 |  |  |  |  |  |  |
Net income (loss) | 251.0 |  |  |  |  |  |  |
Other comprehensive income | (159.5) |  |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2020 |  | 190.3 |  |  |  |  |  |
Balance at Sep. 30, 2020 | 2,402.2 | $ 2.0 | 2,074.0 | (214.7) | 850.3 | (409.7) | 100.3 | 2,402.2
Balance (in shares) at Mar. 31, 2020 |  | 189.8 |  |  |  |  |  |
Balance at Mar. 31, 2020 |  | $ 1.9 | 2,038.1 | (211.8) | 707.7 | (468.2) | 96.5 | 2,164.2
Net Income (Loss) Attributable to Parent |  |  |  |  | 68.5 |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | 1.5 |
Net income (loss) |  |  |  |  |  |  |  | 70.0
Other comprehensive income |  |  |  |  |  | (0.4) | (0.2) | (0.6)
Stock-based compensation |  |  | 15.9 |  |  |  |  | 15.9
Exercise of stock options |  | 0.3 |  |  |  |  |  |
Exercise of stock options |  | $ 0.1 | 2.5 |  |  |  |  | 2.6
Treasury stock purchased |  | 0.0 |  |  |  |  |  |
Treasury stock purchased |  |  |  | (0.4) |  |  |  | (0.4)
Dividends to shareholders |  |  |  |  | (14.5) |  |  | (14.5)
Stockholders' Equity, Other |  |  | (0.1) |  |  |  | (0.5) | (0.6)
Balance (in shares) at Jun. 30, 2020 |  | 190.1 |  |  |  |  |  |
Balance at Jun. 30, 2020 |  | $ 2.0 | 2,056.4 | (212.2) | 761.7 | (468.6) | 97.3 | 2,236.6
Net Income (Loss) Attributable to Parent | 102.8 |  |  |  | 102.8 |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | 3.9 |
Net income (loss) | 106.7 |  |  |  |  |  |  | 106.7
Other comprehensive income | 59.5 |  |  |  |  | 58.9 | 0.6 | 59.5
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |  |  | (1.4) | (1.4)
Stock-based compensation |  |  | 7.2 |  |  |  |  | 7.2
Employee share purchase plan |  | 0.1 |  |  |  |  |  |
Employee share purchase plan |  | $ 0.0 | 10.2 |  |  |  |  | 10.2
Exercise of stock options |  | 0.0 |  |  |  |  |  |
Exercise of stock options |  | $ 0.0 | 0.2 |  |  |  |  | 0.2
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  | $ 0.0 |  |  |  |  |  |
Vesting of restricted stock units |  | 0.1 |  |  |  |  |  |
Treasury stock purchased |  | 0.0 |  |  |  |  |  |
Treasury stock purchased |  |  |  | (2.5) |  |  |  | (2.5)
Dividends to shareholders |  |  |  |  | (14.3) |  |  | (14.3)
Stockholders' Equity, Other |  |  |  |  | (0.1) |  | (0.1) | 0.0
Balance (in shares) at Sep. 30, 2020 |  | 190.3 |  |  |  |  |  |
Balance at Sep. 30, 2020 | $ 2,402.2 | $ 2.0 | $ 2,074.0 | $ (214.7) | $ 850.3 | $ (409.7) | $ 100.3 | $ 2,402.2

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