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Condensed Consolidated Statements of Shareholders’ Equity - USD ($) $ in Millions | Total | Common Stock | Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Previously Reported | Previously Reported Common Stock | Previously Reported Paid-in Capital | Previously Reported Retained Earnings | Previously Reported Accumulated Other Comprehensive Income (Loss) | Cumulative Effect of Adoption of New Accounting Standard | Cumulative Effect of Adoption of New Accounting Standard Retained Earnings | Cumulative Effect of Adoption of New Accounting Standard Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of Adoption of New Accounting Standard |  |  |  |  |  |  |  |  |  |  | $ 0.5 | $ 0.5 |
Beginning balance (in shares) at Dec. 31, 2016 |  |  |  |  |  |  | 51,300,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2016 |  |  |  |  |  | $ 1,975.2 | $ 5.1 | $ 660.3 | $ 1,172.8 | $ 137.0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 120.9 |  |  | $ 120.9 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) (Note 13) | 57.4 |  |  |  | $ 57.4 |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | $ (49.5) |  |  | (49.5) |  |  |  |  |  |  |  |  |
Repurchases of Common Stock (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost (Note 11) | $ 9.4 |  | $ 9.4 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (Note 11) (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (Note 11) | 1.7 |  | 3.4 | (1.7) |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 51,500,000 |  |  |  |  | 51,500,000 |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | 2,115.6 | $ 5.1 | 673.1 | 1,224.8 | 212.6 | $ 2,115.6 | $ 5.1 | $ 673.1 | $ 1,243.0 | $ 194.4 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of Adoption of New Accounting Standard |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ (18.2) | $ 18.2
Net Income | 190.1 |  |  | 190.1 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) (Note 13) | (190.8) |  |  |  | (190.8) |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | $ (56.4) |  |  | (56.4) |  |  |  |  |  |  |  |  |
Repurchases of Common Stock (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost (Note 11) | $ 18.6 |  | 18.6 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (Note 11) (in shares) |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (Note 11) | (5.6) | $ 0.0 | (2.6) | (3.0) | 0.0 |  |  |  |  |  |  |  |
Issuances of Common Stock (in shares) |  | 13,100,000 |  |  |  |  |  |  |  |  |  |  |
Issuances of Common Stock | 978.6 | $ 1.4 | 977.2 | 0.0 |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  | 64,700,000 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 3,050.1 | $ 6.5 | 1,666.3 | 1,355.5 | 21.8 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 531.1 |  |  | 531.1 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) (Note 13) | 314.3 |  |  |  | 314.3 |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | $ (68.4) |  |  | (68.4) |  |  |  |  |  |  |  |  |
Repurchases of Common Stock (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost (Note 11) | $ 25.3 |  | 25.3 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (Note 11) (in shares) |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (Note 11) | (9.2) |  | (1.3) | (7.9) |  |  |  |  |  |  |  |  |
Issuances of Common Stock (in shares) |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Issuances of Common Stock | 127.2 | $ 0.2 | 127.0 | 0.0 |  |  |  |  |  |  |  |  |
Shares Issued Under Employee Stock Purchase Plan (Note 10) | 1.9 |  | 1.9 |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  | 66,700,000 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 3,972.3 | $ 6.7 | $ 1,819.2 | $ 1,810.3 | $ 336.1 |  |  |  |  |  |  |  |

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