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Debt (Convertible Debentures) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
$ / shares
Dec. 31, 2009
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 $ 14.91      
Maximum percentage of debenture trading price   98.00%    
Deferred tax impact on convertible debt $ 189.6 $ 176.0    
Temporary Equity, Par Value 62.5 $ 62.9    
5.75% Junior Subordinated Convertible Debentures [Member]        
Debt Instrument        
Fair value of convertible debt 311.6     $ 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 $ 11.47   $ 12.07  
Junior subordinated convertible debentures convertible equity instruments in conversion 87.21   82.82  
Debt Instrument, Convertible, Terms of Conversion Feature 1000   1000