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v3.20.2

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions | Total | Common stock | Retained earnings | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | ---
Equity, beginning balance at Dec. 31, 2018 | $ 1,693.9 | $ 866.7 | $ 851.8 | $ (24.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 79.5 |  | 79.5 |
Other comprehensive income (loss), net of tax expense | 35.1 | 0.0 | 0.0 | 35.1
Common stock transactions: |  |  |  |
Common shares purchased and retired | (2.5) | (2.5) | 0.0 | 0.0
Stock Issued During Period, Value, New Issues | 176.1 | 176.1 | 0.0 | 0.0
Non-vested common shares issued | 0.0 | 0.0 | 0.0 | 0.0
Non-vested common shares forfeited or canceled | 0.0 | 0.0 | 0.0 | 0.0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts | 0.7 | 0.7 | 0.0 | 0.0
Stock-based compensation expense | 4.6 | 4.6 | 0.0 | 0.0
Common cash dividend declared | (38.8) | 0.0 | (38.8) | 0.0
Equity, ending balance at Jun. 30, 2019 | 1,948.6 | 1,045.6 | 892.5 | 10.5
Equity, beginning balance at Mar. 31, 2019 | 1,736.9 | 866.6 | 874.7 | (4.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 37.9 |  | 37.9 |
Other comprehensive income (loss), net of tax expense | 14.9 |  |  | 14.9
Common stock transactions: |  |  |  |
Common shares purchased and retired | (0.1) | (0.1) |  |
Stock Issued During Period, Value, New Issues | 176.1 | 176.1 |  |
Non-vested common shares forfeited or canceled | 0.0 | 0.0 |  |
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts | 0.3 | 0.3 |  |
Stock-based compensation expense | 2.7 | 2.7 |  |
Common cash dividend declared | (20.1) |  | (20.1) |
Equity, ending balance at Jun. 30, 2019 | 1,948.6 | 1,045.6 | 892.5 | 10.5
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle | (24.1) | 0.0 | (24.1) | 0.0
Equity, beginning balance at Dec. 31, 2019 | 2,013.9 | 1,049.3 | 953.6 | 11.0
Equity, beginning balance at Dec. 31, 2019 | 2,013.9 | 1,049.3 | 953.6 | 11.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 66.0 |  | 66.0 |
Other comprehensive income (loss), net of tax expense | 54.2 | 0.0 | 0.0 | 54.2
Common stock transactions: |  |  |  |
Common shares purchased and retired | (32.6) | (32.6) | 0.0 | 0.0
Stock Issued During Period, Value, New Issues | 0.0 | 0.0 | 0.0 | 0.0
Non-vested common shares issued | 0.0 | 0.0 | 0.0 | 0.0
Non-vested common shares forfeited or canceled | 0.0 | 0.0 | 0.0 | 0.0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts | 0.7 | 0.7 | 0.0 | 0.0
Stock-based compensation expense | 3.8 | 3.8 | 0.0 | 0.0
Common cash dividend declared | (83.0) | 0.0 | (83.0) | 0.0
Equity, ending balance at Jun. 30, 2020 | 1,998.9 | 1,021.2 | 912.5 | 65.2
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,989.8 | 1,049.3 | 929.5 | 11.0
Equity, beginning balance at Mar. 31, 2020 | 1,956.1 | 1,018.7 | 897.6 | 39.8
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 36.7 |  | 36.7 |
Other comprehensive income (loss), net of tax expense | 25.4 | 0.0 | 0.0 | 25.4
Common stock transactions: |  |  |  |
Common shares purchased and retired | 0.0 | 0.0 | 0.0 | 0.0
Stock Issued During Period, Value, New Issues | 0.0 | 0.0 | 0.0 | 0.0
Non-vested common shares issued | 0.0 | 0.0 | 0.0 | 0.0
Non-vested common shares forfeited or canceled | 0.0 | 0.0 | 0.0 | 0.0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts | 0.1 | 0.1 | 0.0 | 0.0
Stock-based compensation expense | 2.4 | 2.4 | 0.0 | 0.0
Common cash dividend declared | (21.8) | 0.0 | (21.8) | 0.0
Equity, ending balance at Jun. 30, 2020 | $ 1,998.9 | $ 1,021.2 | $ 912.5 | $ 65.2

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant