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CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
$ in Millions
Common Stock and Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Non-controlling Interests
Total
Balance at Dec. 31, 2014 $ 819.4 $ 3,328.5 $ (48.9) $ 28.9 $ 4,127.9
Balance (in shares) at Dec. 31, 2014 77,337,251        
Increase (Decrease) in Stockholders' Equity          
Net income   311.5   4.7 316.2
Other comprehensive income (loss)     (50.8)   (50.8)
Noncontrolling interest purchased $ (0.6)     (2.0) (2.6)
Payments to noncontrolling interest holders       (3.0) (3.0)
Stock-based compensation $ 16.8       16.8
Stock-based compensation (in shares) 271,438        
Stock options exercised $ 15.1       15.1
Stock options exercised (in shares) 325,024        
Repurchase of common shares $ (355.5)       $ (355.5)
Repurchase of common shares (in shares) (6,194,641)       (6,200,000)
Stock-based compensation tax deficit   (1.3)     $ (1.3)
Delaware reincorporation $ 38.6 (38.6)      
Cash dividends and dividend equivalents - $1.80 and $1.65 and $1.60 per share for the year ended on December 31, 2017 and December 31, 2016 and December 31, 2015, respectively   (120.1)     (120.1)
Balance at Dec. 31, 2015 $ 533.8 3,480.0 (99.7) 28.6 3,942.7
Balance (in shares) at Dec. 31, 2015 71,739,072        
Increase (Decrease) in Stockholders' Equity          
Net income   304.3   4.8 309.1
Other comprehensive income (loss)     (5.0)   (5.0)
Payments to noncontrolling interest holders       (3.1) (3.1)
Stock-based compensation $ 18.0       18.0
Stock-based compensation (in shares) 188,576        
Stock options exercised $ 37.5       37.5
Stock options exercised (in shares) 755,145        
Cumulative effect of change in accounting for stock-based compensation $ 1.0 (0.6)     $ 0.4
Repurchase of common shares (in shares)         0
Cash dividends and dividend equivalents - $1.80 and $1.65 and $1.60 per share for the year ended on December 31, 2017 and December 31, 2016 and December 31, 2015, respectively   (120.5)     $ (120.5)
Balance at Dec. 31, 2016 $ 590.3 3,663.2 (104.7) 30.3 $ 4,179.1
Balance (in shares) at Dec. 31, 2016 72,682,793       72,682,793
Increase (Decrease) in Stockholders' Equity          
Net income   613.4   7.6 $ 621.0
Other comprehensive income (loss)     33.1   33.1
Payments to noncontrolling interest holders       (5.1) (5.1)
Stock-based compensation $ 24.1       24.1
Stock-based compensation (in shares) 164,958        
Stock options exercised $ 5.2       5.2
Stock options exercised (in shares) 98,405        
Repurchase of common shares $ (25.0)       $ (25.0)
Repurchase of common shares (in shares) (336,616)       (300,000)
Cash dividends and dividend equivalents - $1.80 and $1.65 and $1.60 per share for the year ended on December 31, 2017 and December 31, 2016 and December 31, 2015, respectively   (132.5)     $ (132.5)
Balance at Dec. 31, 2017 $ 594.6 $ 4,144.1 $ (71.6) $ 32.8 $ 4,699.9
Balance (in shares) at Dec. 31, 2017 72,609,540       72,609,540