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Debt (Convertible Debentures) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2012
USD ($)
$ / shares
Dec. 31, 2009
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
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 $ 14.95        
Maximum percentage of debenture trading price 98.00%        
Deferred tax impact on convertible debt $ 176.0     $ 175.8  
Temporary Equity, Par Value 62.9     $ 64.3 $ 65.5
5.75% Junior Subordinated Convertible Debentures [Member]          
Debt Instrument          
Fair value of convertible debt $ 286.1   $ 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      
Debt Instrument, Interest Rate, Stated Percentage   5.75%      
Debt Instrument, Maturity Date   Sep. 15, 2029      
Junior subordinated convertible debentures convertible conversion price | $ / shares $ 11.50 $ 12.07      
Junior subordinated convertible debentures convertible equity instruments in conversion 86.95 82.82      
Debt Instrument, Convertible, Terms of Conversion Feature 1000 1000