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Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Apr. 01, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Common Stock, Value, Outstanding | $ 53.1 | $ 53.1 | $ 53.1 | $ 53.1 | $ 53.1 |  | $ 53.1 | $ 53.1 | $ 53.1
Additional Paid in Capital, Common Stock | 945.5 | 945.1 | 945.5 | 945.1 | 941.3 |  | 951.9 | 907.2 | 903.8
Retained Earnings (Accumulated Deficit) | 1,815.0 | 1,595.4 | 1,815.0 | 1,595.4 | 1,772.0 |  | 1,630.2 | 1,545.3 | 1,408.4
Accumulated Other Comprehensive Income (Loss), Net of Tax | (80.1) | (88.8) | (80.1) | (88.8) | (97.5) |  | (95.3) | (69.9) | (38.3)
Treasury Stock, Value | (988.7) | (924.9) | (988.7) | (924.9) | (957.6) |  | (960.3) | (913.9) | (884.3)
Stockholders' Equity Attributable to Noncontrolling Interest | 72.7 | 60.5 | 72.7 | 60.5 | $ 72.3 |  | $ 63.1 | $ 30.5 | 32.2
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Beginning Balance | 1,783.6 | 1,552.3 | 1,642.7 | 1,474.9 |  |  |  |  |
Net income | 66.7 | 72.3 | 256.9 | 244.7 |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (63.0) | (24.3) | (62.1) | (62.5) |  |  |  |  |
Pension and postretirement liability adjustment (net of the income tax benefit of $1.5 million) | 76.7 | 0.0 | 76.6 | 0.0 |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 1.9 | (0.4) | 0.5 | 4.0 |  |  |  |  |
Payments of Ordinary Dividends | (0.3) |  | (0.3) |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 66.0 |  | 66.0 |  |  |  |  |
Dividends - $0.26 per share | (21.2) | (21.5) | (63.8) | (64.2) |  |  |  |  |
Stock-based compensation expense | 5.8 | 7.7 | 20.7 | 25.5 |  |  |  |  |
Payments for Repurchase of Common Stock | (32.5) | (13.4) | (56.1) | (63.0) |  |  |  |  |
Stock option exercise activity | (1.0) | (2.1) | (9.9) | (12.7) |  |  |  |  |
Restricted shares surrendered (issued) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement | (1.2) | (0.4) | (9.3) | (5.4) |  |  |  |  |
Ending Balance | 1,817.5 | 1,640.4 | 1,817.5 | 1,640.4 |  |  |  |  |
Other Paid-In Capital [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 30.9 |  | 30.9 |  |  |  |  |
Stock-based compensation expense | 5.8 | 7.7 | 20.7 | 25.5 |  |  |  |  |
Stock option exercise activity | (1.0) | (0.6) | (4.4) | (3.7) |  |  |  |  |
Restricted shares surrendered (issued) | (0.6) | (0.1) | (22.7) | (11.4) |  |  |  |  |
Earnings Invested in the Business [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Net income | 64.2 | 71.6 | 248.6 | 242.8 |  |  |  |  |
Dividends - $0.26 per share | (21.2) | (21.5) | (63.8) | (64.2) |  |  |  |  |
Accumulated Other Comprehensive (Loss) [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (61.2) | (18.5) | (61.9) | (53.8) |  |  |  |  |
Pension and postretirement liability adjustment (net of the income tax benefit of $1.5 million) | 76.7 |  | 76.6 |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 1.9 | (0.4) | 0.5 | 4.0 |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock | (32.5) | 13.4 | (56.1) | 63.0 |  |  |  |  |
Stock option exercise activity | (2.0) | (2.7) | (14.3) | (16.4) |  |  |  |  |
Restricted shares surrendered (issued) | 0.6 | 0.1 | 22.7 | 11.4 |  |  |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement | (1.2) | 0.4 | (9.3) | 5.4 |  |  |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Net income | 2.5 | 0.7 | 8.3 | 1.9 |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (1.8) | (5.8) | (0.2) | (8.7) |  |  |  |  |
Payments of Ordinary Dividends | $ 0.3 |  | $ 0.3 |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 35.1 |  | 35.1 |  |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 7.7 |  | 7.7 |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Earnings Invested in the Business [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 7.7 |  | 7.7 |  |  |  |  |
Accounting Standard Update 2018-02 [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | $ (39.0)
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 0.0 |  | 0.0 |  |  |  |  |
Accounting Standard Update 2018-02 [Member] | Earnings Invested in the Business [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 0.7 |  | 0.7 |  |  |  |  |
Accounting Standard Update 2018-02 [Member] | Accumulated Other Comprehensive (Loss) [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (0.7) |  | $ (0.7) |  |  |  |  |
Diamond Chain [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  | $ 1.8 |  |  |
Diamond Chain [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Roll Forward |  |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  | $ 1.8 |  |  |

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