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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 20, 2016
Jan. 01, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share Repurchase Plan            
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan     8,400,000   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%   12.00%  
Number of shares repurchased under stock repurchase plan         0  
Dividends            
Common stock dividend quarterly declared and paid per share (in dollars per share)     $ 0.40 $ 0.40 $ 0.80 $ 0.80
Dividends paid     $ 29.0 $ 29.7 $ 57.1 $ 60.4
Changes in unvested restricted stock grants and RSUs            
Unvested at the beginning of the period (in shares)   900,410     900,410  
Granted (in shares)         524,746  
Vested (in shares)         (13,317)  
Cancelled (in shares)         (19,114)  
Unvested at the end of the period (in shares)     1,392,725   1,392,725  
Shares reserved for future grants (all plans)     1,862,538   1,862,538  
Weighted Average Grant Date Fair Value            
Unvested at the beginning of the period (in dollars per share)   $ 63.26     $ 63.26  
Granted (in dollars per shares)         69.20  
Vested (in dollars per shares)         69.63  
Cancelled (in dollars per shares)         64.41  
Unvested at the end of the period (in dollars per shares)     $ 65.43   $ 65.43  
Subsequent event            
Dividends            
Common stock quarterly dividend per share (in dollars per share) $ 0.425          
Percentage of increase in common stock dividends declared 6.30%          
Early Adoption | Improvements to Employee Share-Based Payment Accounting            
Stock-Based Compensation            
Cumulative-effect adjustment   $ 0.6        
Common Stock Including Additional Paid in Capital            
Common Stock and Additional Paid-In (in Shares)            
Stock-based compensation ( in shares)     11,611   150,162  
Stock options exercised (in shares)     269,575   614,745  
Total ( in shares)     281,186   764,907  
Common Stock and Additional Paid-In (in Amount)            
Stock-based compensation     $ 8.1   $ 10.2  
Stock options exercised     13.6   30.1  
Cumulative effect of change in accounting for stock-based compensation         1.0  
Total     $ 21.7   $ 41.3  
Weighted Average Exercise/(Purchase) Price            
Stock options exercised (in dollars per share)     $ 52.96   $ 49.01  
Restricted stock            
Changes in unvested restricted stock grants and RSUs            
Granted (in shares)         11,851  
RSU's            
Dividends            
Dividend equivalents         $ 0.9 $ 1.0
Stock-Based Compensation            
Vesting period (in years)         3 years  
Changes in unvested restricted stock grants and RSUs            
Granted (in shares)         512,895  
RSU's | Performance-based            
Changes in unvested restricted stock grants and RSUs            
Granted (in shares)         190,175