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Consolidated Statements of Stockholders Equity Statement - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income, Net
Treasury Stock [Member]
Stockholders' equity, shares at Dec. 31, 2018   56,975,675        
Stockholders' equity, value at Dec. 31, 2018 $ 1,018.2 $ 0.6 $ 388.8 $ 1,030.7 $ (13.7) $ (388.2)
Stock-based obligations, shares   0        
Stock-based obligations, value $ 2.4 $ 0.0 2.4 0.0 0.0 0.0
Stock-options exercised, shares 1,300 1,300        
Stock-options exercised, value $ 0.1 $ 0.0 0.1 0.0 0.0 0.0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares   167,555        
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value (3.2) $ 0.0 (3.2) 0.0 0.0 0.0
Acquisition of common stock, shares   0        
Acquisition of common stock, value (27.5) $ 0.0 0.0 0.0 0.0 (27.5)
Dividends declared, shares   0        
Dividends declared, value (7.4) $ 0.0 0.0 (7.4) 0.0 0.0
Net income 51.8 0.0 0.0 51.8 0.0 0.0
Change in net unrealized gains in investments, net of tax 37.3 $ 0.0 0.0 0.0 37.3 0.0
Stockholders' equity, shares at Mar. 31, 2019   57,144,530        
Stockholders' equity, value at Mar. 31, 2019 1,071.7 $ 0.6 388.1 1,075.1 23.6 (415.7)
Stockholders' equity, shares at Dec. 31, 2018   56,975,675        
Stockholders' equity, value at Dec. 31, 2018 $ 1,018.2 $ 0.6 388.8 1,030.7 (13.7) (388.2)
Stock-options exercised, shares 31,630          
Stockholders' equity, shares at Dec. 31, 2019 57,184,370 57,184,370        
Stockholders' equity, value at Dec. 31, 2019 $ 1,165.8 $ 0.6 396.4 1,158.8 65.3 (455.3)
Stock-based obligations, shares   0        
Stock-based obligations, value $ 2.5 $ 0.0 2.5 0.0 0.0 0.0
Stock-options exercised, shares 36,500 36,500        
Stock-options exercised, value $ 0.8 $ 0.0 0.8 0.0 0.0 0.0
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, shares   154,715        
Vesting of RSUs and PSUs, net of shares withheld to satisfy minimum tax withholding, value (2.7) $ 0.0 (2.7) 0.0 0.0 0.0
Acquisition of common stock, shares   0        
Acquisition of common stock, value (42.5) $ 0.0 0.0 0.0 0.0 (42.5)
Dividends declared, shares   0        
Dividends declared, value (8.0) $ 0.0 0.0 (8.0) 0.0 0.0
Net income (34.9) 0.0 0.0 (34.9) 0.0 0.0
Change in net unrealized gains in investments, net of tax $ (23.7) $ 0.0 0.0 0.0 (23.7) 0.0
Stockholders' equity, shares at Mar. 31, 2020 57,375,585 57,375,585        
Stockholders' equity, value at Mar. 31, 2020 $ 1,057.3 $ 0.6 $ 397.0 $ 1,115.9 $ 41.6 $ (497.8)