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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, 2014   87,800          
Balance at beginning of period at Dec. 31, 2014 $ 619.5 $ 1.0 $ 2,810.5 $ (1,879.1) $ (0.5) $ (458.7) $ 146.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 239.0     183.1     55.9
Conversion of convertible debt, net of tax (shares)   3,300          
Conversion of preferred stock 93.2   93.2        
Receipt of treasury stock (shares)   (500)          
Receipt of treasury stock (17.2)         (17.2)  
Dividends declared on common stock (79.9)   (79.9)        
Dividends declared on convertible perpetual preferred stock (1.6)   (1.6)        
Stock-based compensation 22.4   22.4        
Stock options exercised (shares)   200          
Stock options exercised 2.3   6.7     (4.4)  
Distributions declared (49.0)           (49.0)
Repurchases of common stock in open market (shares)   (1,300)          
Repurchases of common stock in open market (45.3)         (45.3)  
Capital contributions from consolidated affiliates 14.8           14.8
Fair value adjustments to redeemable noncontrolling interests, net of tax (18.2)   (18.2)        
Other (shares)   600          
Other (0.7) $ 0.1 1.8   (0.7) (1.8) (0.1)
Balance at end of period (shares) at Dec. 31, 2015   90,100          
Balance at end of period at Dec. 31, 2015 779.3 $ 1.1 2,834.9 (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 on common stock (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, net of tax (6.7)   (6.7)        
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 928.7 $ 1.1 2,799.1 (1,448.4) (1.2) (614.7) 192.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 317.5     256.3     61.2
Conversion of convertible debt, net of tax (shares)   8,900          
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments     53.7        
Conversion of preferred stock 328.2         274.5  
Receipt of treasury stock (shares)   (900)          
Receipt of treasury stock (19.8)         (19.8)  
Dividends declared on common stock (95.2)   (95.2)        
Stock-based compensation $ 21.3   21.3        
Stock options exercised (shares) 1,107 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, net of tax (41.0)   (41.0)        
Other (shares)   500          
Other (0.4)   6.5 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 $ 1,424.6 $ 1.1 $ 2,791.4 $ (1,191.0) $ (1.3) $ (418.5) $ 242.9