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Debt (Convertible Debentures) (Details)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
Dec. 31, 2012
USD ($)
$ / shares
Dec. 31, 2009
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument        
Debt Instrument, Convertible, Threshold Trading Days 20      
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30 days      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%      
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 14.85      
Maximum percentage of debenture trading price 98.00%      
Deferred tax impact on convertible debt $ 185.5     $ 176.0
Temporary Equity, Par Value 62.1     $ 62.9
5.75% Junior Subordinated Convertible Debentures [Member]        
Debt Instrument        
Fair value of convertible debt 283.3   $ 56.3  
Deferred tax impact on convertible debt     $ 32.7  
Debt Instrument, Convertible, Terms of Conversion Feature     1000  
4.875% Unsecured Senior Notes [Member]        
Debt Instrument        
Extinguishment of Debt, Amount   $ 122.5    
Debt Instrument, Interest Rate, Stated Percentage     4.875%  
5.75% Junior Subordinated Convertible Debentures [Member]        
Debt Instrument        
Debt Instrument, Face Amount $ 125.0 $ 125.0    
Debt Instrument, Interest Rate, Stated Percentage   5.75%    
Debt Instrument, Maturity Date   Sep. 15, 2029    
Junior subordinated convertible debentures convertible conversion price | $ / shares $ 11.43 $ 12.07    
Junior subordinated convertible debentures convertible equity instruments in conversion 87.52 82.82    
Debt Instrument, Convertible, Terms of Conversion Feature 1000 1000