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Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Deferred Compensation Equity
Accumulated Other Comprehensive Income (loss)
Retained Earnings
Shares in Treasury
Increase (Decrease) in Shareholders' Equity              
Adoption of accounting standards | Adjustments for New Accounting Pronouncement $ 6.5       $ (6.5) $ 13.0  
Balance at the beginning of the period at Dec. 31, 2017 2,528.3 $ 78.7 $ 353.7 $ 10.4 (85.7) 2,820.8 $ (649.6)
Balance (in shares) at Dec. 31, 2017   61,800,000         16,600,000
Increase (Decrease) in Shareholders' Equity              
Net income 309.6         309.6  
Other comprehensive income (loss), net of tax 23.3       23.3    
Cash dividends - $0.40 and $0.37 for the three months ended March 31, 2019 and 2018, respectively (23.1)         (23.1)  
Repurchases of common stock (129.3)           $ (129.3)
Repurchases of common stock (in shares)   (1,200,000)         1,200,000
Issuances and deferrals. net for stock based compensation (1) [1] 5.5   3.9 0.7     $ 0.9
Issuances and deferrals, net for stock based compensation (in shares) [1]   100,000         (100,000)
Balance at the end of the period at Mar. 31, 2018 2,720.8 $ 78.7 357.6 11.1 (68.9) 3,120.3 $ (778.0)
Balance (in shares) at Mar. 31, 2018   60,700,000         17,700,000
Balance at the beginning of the period at Dec. 31, 2018 $ 2,597.4 $ 78.7 383.8 $ 8.0 (122.1) 3,351.4 $ (1,102.4)
Balance (in shares) at Dec. 31, 2018 57,957,912 57,900,000         20,500,000
Increase (Decrease) in Shareholders' Equity              
Net income $ 79.4         79.4  
Other comprehensive income (loss), net of tax 6.2       6.2    
Cash dividends - $0.40 and $0.37 for the three months ended March 31, 2019 and 2018, respectively (23.3)         (23.3)  
Repurchases of common stock (149.9)           $ (149.9)
Repurchases of common stock (in shares)   (1,300,000)         1,300,000
Issuances and deferrals. net for stock based compensation (1) [1] 14.9   6.3       $ 8.8
Issuances and deferrals, net for stock based compensation (in shares) [1]   200,000   (200,000)     (200,000)
Balance at the end of the period at Mar. 31, 2019 $ 2,524.7 $ 78.7 $ 390.1 $ 7.8 $ (115.9) $ 3,407.5 $ (1,243.5)
Balance (in shares) at Mar. 31, 2019 56,802,175 56,800,000         21,600,000
[1] Issuances and deferrals, net for stock based compensation reflects share activity related to option exercises, restricted and performance shares vested and net issuances and deferrals associated with deferred compensation equity.