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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, 2013   88,000          
Balance at beginning of period at Dec. 31, 2013 $ 468.7 $ 1.0 $ 2,849.4 $ (2,101.1) $ (0.1) $ (404.6) $ 124.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 275.1     222.0     53.1
Receipt of treasury stock (shares)   (300)          
Receipt of treasury stock (9.7)         (9.7)  
Dividends declared on common stock (69.0)   (69.0)        
Dividends declared on convertible perpetual preferred stock (6.3)   (6.3)        
Stock-based compensation 23.9   23.9        
Stock options exercised (shares)   300          
Stock options exercised 7.4   7.5     (0.1)  
Stock warrants exercised (shares)   200          
Stock warrants exercised 6.3   6.3        
Distributions declared (44.9)           (44.9)
Repurchases of common stock in open market (shares)   (1,300)          
Repurchases of common stock in open market (43.1)         (43.1)  
Consolidation of Fairlawn Rehabilitation Hospital 14.0           14.0
Other (shares)   900          
Other (2.9)   (1.3)   (0.4) (1.2)  
Balance at end of period (shares) at Dec. 31, 2014   87,800          
Balance at end 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 preferred stock (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) 563 600          
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)        
Equity portion of convertible debt 17.3   17.3        
Other (shares)   400          
Other 4.8   4.0     (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