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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 25, 2017
Mar. 31, 2017
Mar. 31, 2016
Share Repurchase Plan      
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan   8,400,000  
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan, expressed as a percentage of outstanding shares (as a percent)   12.00%  
Number of shares repurchased under stock repurchase plan   0  
Dividends      
Common stock quarterly dividend per share (in dollars per share) $ 0.45    
Common stock dividend quarterly declared and paid per share (in dollars per share)   $ 0.45 $ 0.40
Dividends paid   $ 32.8 $ 28.9
Changes in unvested restricted stock grants and RSUs      
Unvested at the beginning of the period (in shares)   985,540  
Granted (in shares)   446,525  
Vested (in shares)   (3,939)  
Cancelled (in shares)   (6,886)  
Unvested at the end of the period (in shares)   1,421,240  
Shares reserved for future grants (all plans)   1,635,660  
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share)   $ 64.34  
Granted (in dollars per shares)   79.60  
Vested (in dollars per shares)   61.45  
Cancelled (in dollars per shares)   64.31  
Unvested at the end of the period (in dollars per shares)   $ 69.15  
Common Stock Including Additional Paid in Capital      
Common Stock and Additional Paid-In (in Shares)      
Stock-based compensation ( in shares)   141,508  
Stock options exercised (in shares)   55,305  
Total ( in shares)   196,813  
Payments made to tax authorities on employees' behalf   $ 0.7  
Common Stock and Additional Paid-In (in Amount)      
Stock-based compensation   4.8  
Stock options exercised   2.8  
Total   $ 7.6  
Weighted Average Exercise/(Purchase) Price      
Stock options exercised (in dollars per share)   $ 49.82  
RSU's      
Dividends      
Dividend equivalents   $ 0.9 $ 0.9
Stock-Based Compensation      
Vesting period (in years)   3 years  
Changes in unvested restricted stock grants and RSUs      
Granted (in shares)   446,525  
RSU's | Performance-based      
Changes in unvested restricted stock grants and RSUs      
Granted (in shares)   169,009