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Consolidated Statement of Shareholders' Equity - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock [Member]
Capital in Excess of Par Value [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Noncontrolling Interests [Member]
Balance at beginning of period (shares) at Dec. 31, 2015   90,100          
Balance at beginning of period at Dec. 31, 2015 $ 765.4 $ 1.1 $ 2,821.0 $ (1,696.0) $ (1.2) $ (527.4) $ 167.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 304.0     247.6     56.4
Receipt of treasury stock (shares)   (500)          
Receipt of treasury stock (11.6)         (11.6)  
Dividends declared ($1.04 per share) (84.9)   (84.9)        
Stock-based compensation 21.4   21.4        
Stock options exercised (shares)   600          
Stock options exercised 5.3   13.1     (7.8)  
Distributions declared (54.2)           (54.2)
Repurchases of common stock in open market (shares)   (1,700)          
Repurchases of common stock in open market (65.6)         (65.6)  
Capital contributions from consolidated affiliates 19.6           19.6
Fair value adjustments to redeemable noncontrolling interests (10.9)   (10.9)        
Windfall tax benefits from share-based compensation 17.3   17.3        
Other (shares)   400          
Other 4.8 $ 0.0 4.0   0.0 (2.3) 3.1
Balance at end of period (shares) at Dec. 31, 2016   88,900          
Balance at end of period at Dec. 31, 2016 910.6 $ 1.1 2,781.0 (1,448.4) (1.2) (614.7) 192.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income $ 332.3     271.1     61.2
Conversion of convertible debt, net of tax (shares) 8,900            
Conversion of convertible debt, net of tax     53.7        
Stock Issued During Period, Value, Conversion of Convertible Securities $ 328.2         274.5  
Receipt of treasury stock (shares)   (900)          
Receipt of treasury stock (19.8)         (19.8)  
Dividends declared ($1.04 per share) (95.2)   (95.2)        
Stock-based compensation 21.3   21.3        
Stock options exercised (shares)   1,100          
Stock options exercised 1.1   20.4     (19.3)  
Stock warrants exercised (shares)   700          
Stock warrants exercised 26.6   26.6        
Distributions declared (50.5)           (50.5)
Repurchases of common stock in open market (shares)   (900)          
Repurchases of common stock in open market (38.1)         (38.1)  
Capital contributions from consolidated affiliates 46.2           46.2
Fair value adjustments to redeemable noncontrolling interests (67.0)   (67.0)        
Other (shares)   500          
Other (0.3) $ 0.0 6.6 1.1 (0.1) (1.1) (6.8)
Balance at end of period (shares) at Dec. 31, 2017   98,300          
Balance at end of period at Dec. 31, 2017 1,395.4 $ 1.1 2,747.4 (1,176.2) (1.3) (418.5) 242.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 361.5     292.3     69.2
Receipt of treasury stock (shares)   (200)          
Receipt of treasury stock (8.3)         (8.3)  
Dividends declared ($1.04 per share) (103.7)   (103.7)        
Stock-based compensation $ 28.9   28.9        
Stock options exercised (shares) 115 100          
Stock options exercised $ 3.2   3.2     0.0  
Distributions declared (71.1)           (71.1)
Capital contributions from consolidated affiliates 38.8           38.8
Fair value adjustments to redeemable noncontrolling interests (91.0)   (91.0)        
Other (shares)   700          
Other 3.3   3.9 (1.3) 1.3 (1.1) 0.5
Balance at end of period (shares) at Dec. 31, 2018   98,900          
Balance at end of period at Dec. 31, 2018 $ 1,557.0 $ 1.1 $ 2,588.7 $ (885.2) $ 0.0 $ (427.9) $ 280.3