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Shareholders' Equity and Stock-Based Compensation (Details 7) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 18, 2013
Jan. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 16, 2012
Common stock repurchased (in shares)       4,852,000 3,493,000  
Total cash consideration paid for common stock repurchased     $ 0 $ 488,800,000 $ 260,200,000  
Dividends            
Dividends declared     30,900,000 63,200,000 45,500,000  
Dividends paid     $ 45,900,000 $ 59,800,000 $ 34,700,000  
Preferred Stock            
Authorized no par value preferred stock (in shares)     3,000,000.0 3,000,000 3,000,000  
Common Stock In Treasury            
Common stock repurchased (in shares)       4,852,000 3,493,000  
Common Stock in Treasury            
Decrease in stock by the settlement of restricted stock units     $ 7,000,000 $ 13,800,000 $ 14,200,000  
Increase in the stock for common stock surrendered by recipients of restricted stock as a means of funding minimum income tax withholding     $ 1,800,000 $ 7,900,000 $ 11,000,000  
Common Stock In Treasury | Share Repurchase Program            
Authorized repurchase amount under the written trading plan $ 500,000,000.0         $ 350,000,000.0
Common stock repurchased (in shares) 115,000 1,514,000   4,852,000 1,864,000  
Total cash consideration paid for common stock repurchased $ 11,200,000 $ 104,400,000   $ 488,800,000 $ 144,600,000