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Consolidated Statements of Changes in Shareholders' Equity Statement - USD ($) $ in Millions | Total | Serial Preferred Stock | Preferred Shares, No Par Value | Common Shares, $1.00 Par Value | Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Series B Preferred Stock Serial Preferred Stock | Voting Preference Shares
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Cash dividends declared on common stock (in dollars per share) | $ 0.30 |  |  |  |  |  |  |  |
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share) |  |  |  |  |  |  |  | $ 26.875 |
Balance, Beginning of period at Dec. 31, 2021 |  |  | $ 493.9 | $ 584.4 | $ 1,772.9 | $ 15,339.7 | $ 40.7 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | $ (104.9) |  |  |  |  | (104.9) |  |  |
Treasury shares purchased |  |  |  | (0.7) | (2.2) | (75.7) |  |  |
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share) |  |  |  |  |  | (175.2) |  |  |
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share) |  |  |  |  |  | (13.4) |  |  |
Net restricted equity awards issued/vested |  |  |  | 1.4 | (1.4) |  |  |  |
Amortization of equity-based compensation |  |  |  |  | 69.7 |  |  |  |
Reinvested dividends on restricted stock units |  |  |  |  | 0.6 | (0.6) |  |  |
Other, net |  |  |  |  |  | 17.6 |  |  |
Other comprehensive income (loss) | (3,170.6) |  |  |  |  |  | (3,170.6) |  |
Balance, End of period at Sep. 30, 2022 | $ 14,776.2 |  | 493.9 | 585.1 | 1,839.6 | 14,987.5 | (3,129.9) |  |
Cash dividends declared on common stock (in dollars per share) | $ 0.10 |  |  |  |  |  |  |  |
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share) |  |  |  |  |  |  |  | 26.875 |
Balance, Beginning of period at Jun. 30, 2022 |  |  | 493.9 | 584.9 | 1,815.2 | 14,967.7 | (2,209.0) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | $ 124.1 |  |  |  |  | 124.1 |  |  |
Treasury shares purchased |  |  |  | (0.4) | (1.3) | (47.4) |  |  |
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share) |  |  |  |  |  | (58.4) |  |  |
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share) |  |  |  |  |  | (13.4) |  |  |
Net restricted equity awards issued/vested |  |  |  | 0.6 | (0.6) |  |  |  |
Amortization of equity-based compensation |  |  |  |  | 26.0 |  |  |  |
Reinvested dividends on restricted stock units |  |  |  |  | 0.3 | (0.3) |  |  |
Other, net |  |  |  |  |  | 15.2 |  |  |
Other comprehensive income (loss) | (920.9) |  |  |  |  |  | (920.9) |  |
Balance, End of period at Sep. 30, 2022 | $ 14,776.2 |  | 493.9 | 585.1 | 1,839.6 | 14,987.5 | (3,129.9) |  |
Preferred stock, no par value |  |  |  |  |  |  |  | $ 0 |
Common shares, par value (USD per share) | $ 1.00 |  |  |  |  |  |  |  |
Preferred stock, shares authorized (shares) |  | 20,000,000.0 |  |  |  |  |  | 500,000 | 5,000,000.0
Preferred stock, shares issued (shares) |  |  |  |  |  |  |  | 500,000 | 0
Preferred stock, no par value |  |  |  |  |  |  |  | $ 0 |
Common shares, par value (USD per share) | 1.00 |  |  |  |  |  |  |  |
Preferred stock, shares authorized (shares) |  | 20,000,000.0 |  |  |  |  |  | 500,000 |
Preferred stock, shares issued (shares) |  |  |  |  |  |  |  | 500,000 |
Cash dividends declared on common stock (in dollars per share) | $ 0.30 |  |  |  |  |  |  |  |
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share) |  |  |  |  |  |  |  | $ 39.60163 |
Balance, Beginning of period at Dec. 31, 2022 | $ 15,891.0 |  | 493.9 | 584.9 | 1,893.0 | 15,721.2 | (2,802.0) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | 1,914.6 |  |  |  |  | 1,914.6 |  |  |
Treasury shares purchased |  |  |  | (0.6) | (2.1) | (77.1) |  |  |
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share) |  |  |  |  |  | (175.4) |  |  |
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share) |  |  |  |  |  | (19.8) |  |  |
Net restricted equity awards issued/vested |  |  |  | 0.7 | (0.7) |  |  |  |
Amortization of equity-based compensation |  |  |  |  | 86.7 |  |  |  |
Reinvested dividends on restricted stock units |  |  |  |  | 1.0 | (1.0) |  |  |
Other, net |  |  |  |  |  | 18.4 |  |  |
Other comprehensive income (loss) | (240.4) |  |  |  |  |  | (240.4) |  |
Balance, End of period at Sep. 30, 2023 | $ 17,395.3 |  | 493.9 | 585.0 | 1,977.9 | 17,380.9 | (3,042.4) |  |
Cash dividends declared on common stock (in dollars per share) | $ 0.10 |  |  |  |  |  |  |  |
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share) |  |  |  |  |  |  |  | 20.67700 |
Balance, Beginning of period at Jun. 30, 2023 |  |  | 493.9 | 585.3 | 1,935.7 | 16,350.4 | (2,654.0) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) | $ 1,121.3 |  |  |  |  | 1,121.3 |  |  |
Treasury shares purchased |  |  |  | (0.3) | (1.1) | (38.3) |  |  |
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share) |  |  |  |  |  | (58.5) |  |  |
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share) |  |  |  |  |  | (10.3) |  |  |
Net restricted equity awards issued/vested |  |  |  | 0.0 | 0.0 |  |  |  |
Amortization of equity-based compensation |  |  |  |  | 42.9 |  |  |  |
Reinvested dividends on restricted stock units |  |  |  |  | 0.4 | (0.4) |  |  |
Other, net |  |  |  |  |  | 16.7 |  |  |
Other comprehensive income (loss) | (388.4) |  |  |  |  |  | (388.4) |  |
Balance, End of period at Sep. 30, 2023 | $ 17,395.3 |  | $ 493.9 | $ 585.0 | $ 1,977.9 | $ 17,380.9 | $ (3,042.4) |  |
Preferred stock, no par value |  |  |  |  |  |  |  | $ 0 |
Common shares, par value (USD per share) | $ 1.00 |  |  |  |  |  |  |  |
Preferred stock, shares authorized (shares) |  | 20,000,000.0 |  |  |  |  |  | 500,000 | 5,000,000.0
Preferred stock, shares issued (shares) |  |  |  |  |  |  |  | 500,000 | 0

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