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Consolidated Statements of Shareholders’ Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income | Previously Reported | Previously Reported Common Stock | Previously Reported Paid-in Capital | Previously Reported Retained Earnings | Previously Reported Accumulated Other Comprehensive Income | 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
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of Adoption of New Accounting Standard |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ (18.2) | $ 18.2
Beginning balance (in shares) at Dec. 31, 2017 |  | 51.5 |  |  |  |  | 51.5 |  |  |  |  |  |
Beginning 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] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 183.6 |  |  | 183.6 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Note 8) | (181.6) |  |  |  | (181.6) |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | (40.7) |  |  | (40.7) |  |  |  |  |  |  |  |  |
Issuances of Common Stock, Net of Transaction Costs (in shares) |  | 13.1 |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Stock, Net of Transaction Costs | 978.5 | $ 1.3 | 977.2 |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost | 13.5 |  | 13.5 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (in shares) |  | 0.1 |  |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged | (5.1) | $ 0.1 | (2.5) | (2.6) | (0.1) |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 64.7 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 3,063.8 | $ 6.5 | 1,661.3 | 1,365.1 | 30.9 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Jun. 30, 2018 |  | 51.6 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2018 | 2,045.7 | $ 5.2 | 681.5 | 1,289.4 | 69.6 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 92.2 |  |  | 92.2 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Note 8) | (38.6) |  |  |  | (38.6) |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | (15.8) |  |  | (15.8) |  |  |  |  |  |  |  |  |
Issuances of Common Stock, Net of Transaction Costs (in shares) |  | 13.1 |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Stock, Net of Transaction Costs | 978.5 | $ 1.3 | 977.2 |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost | 5.4 |  | 5.4 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged | (3.6) |  | (2.8) | (0.7) | (0.1) |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 64.7 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 3,063.8 | $ 6.5 | 1,661.3 | 1,365.1 | 30.9 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 |  | 64.7 |  |  |  |  |  |  |  |  |  |  |
Beginning 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 | 406.4 |  |  | 406.4 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Note 8) | 348.3 |  |  |  | 348.3 |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | (49.5) |  |  | (49.5) |  |  |  |  |  |  |  |  |
Issuances of Common Stock, Net of Transaction Costs (in shares) |  | 1.6 |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Stock, Net of Transaction Costs | 127.2 | $ 0.2 | 127.0 |  |  |  |  |  |  |  |  |  |
Shares Issued Under Employee Stock Purchase Plan | 1.0 |  | 1.0 |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost | 20.0 |  | 20.0 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged (in shares) |  | 0.3 |  |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged | (9.3) |  | (1.4) | (7.9) |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 66.6 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 3,894.2 | $ 6.7 | 1,812.9 | 1,704.5 | 370.1 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Jun. 30, 2019 |  | 66.6 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2019 | 3,683.7 | $ 6.7 | 1,806.4 | 1,593.7 | 276.9 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 129.0 |  |  | 129.0 |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Note 8) | 93.2 |  |  |  | 93.2 |  |  |  |  |  |  |  |
Cash Dividends and Dividend Equivalents to Shareholders | (16.7) |  |  | (16.7) |  |  |  |  |  |  |  |  |
Shares Issued Under Employee Stock Purchase Plan | 1.0 |  | 1.0 |  |  |  |  |  |  |  |  |  |
Equity-based Compensation Cost | 5.9 |  | 5.9 |  |  |  |  |  |  |  |  |  |
Equity-based Awards, Net of Shares Exchanged | (1.9) |  | (0.4) | (1.5) |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 66.6 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | $ 3,894.2 | $ 6.7 | $ 1,812.9 | $ 1,704.5 | $ 370.1 |  |  |  |  |  |  |  |

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