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Condensed Statements of Shareholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Balance (in shares) at Dec. 31, 2016   165.4      
Balance at Dec. 31, 2016 $ 2,273.0 $ 165.4 $ 2,243.8 $ (510.0) $ 373.8
Net income 60.2 0.0 0.0 0.0 60.2
Other comprehensive income (loss) 40.0 0.0 0.0 40.0 0.0
Dividends paid:          
Common stock ($0.60 per share) $ (99.6) $ 0.0 0.0 0.0 (99.6)
Common stock issued for:          
Stock options exercised (in shares) 1.0 1.0      
Stock options exercised $ 18.5 $ 1.0 17.5 0.0 0.0
Other Transactions (in shares)   0.0      
Other Transactions 1.7 $ 0.0 1.7 0.0 0.0
Stock-based compensation 4.7 $ 0.0 4.7 0.0 0.0
Balance (in shares) at Sep. 30, 2017   166.4      
Balance at Sep. 30, 2017 2,298.5 $ 166.4 2,267.7 (470.0) 334.4
Balance (in shares) at Dec. 31, 2017   167.1      
Balance at Dec. 31, 2017 2,753.7 $ 167.1 2,280.9 (484.6) 790.3
Income tax reclassification adjustment 0.0 0.0 0.0 (85.9) 85.9
Net income 274.6 0.0 0.0 0.0 274.6
Other comprehensive income (loss) (0.8) 0.0 0.0 (0.8) 0.0
Dividends paid:          
Common stock ($0.60 per share) (100.3) $ 0.0 0.0 0.0 (100.3)
Common stock repurchased and retired (in shares)   (0.5)      
Common stock repurchased and retired $ (16.8) $ (0.5) (16.3) 0.0 0.0
Common stock issued for:          
Stock options exercised (in shares) 0.2 0.2      
Stock options exercised $ 3.2 $ 0.2 3.0 0.0 0.0
Other Transactions (in shares)   0.0      
Other Transactions 1.5 $ 0.0 1.5 0.0 0.0
Stock-based compensation 7.8 $ 0.0 7.8 0.0 0.0
Balance (in shares) at Sep. 30, 2018   166.8      
Balance at Sep. 30, 2018 $ 2,922.9 $ 166.8 $ 2,276.9 $ (571.3) $ 1,050.5