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Stock-Based Compensation Plans (Details) - USD ($)
$ in Millions
6 Months Ended 114 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
May. 20, 2014
Stock-Based Compensation Plans        
Stock-Based Compensation Plans - Disclosures        
Compensation cost $ 36.1 $ 33.4    
Related income tax benefit 11.5 11.3    
Capitalized as part of an asset $ 1.3 $ 1.3    
2014 Stock Incentive Plan and 2014 Directors Stock Plan        
Stock-Based Compensation Plans - Disclosures        
Maximum number of new shares of common stock available for grant (in shares) 12,000,000   12,000,000  
Stock Incentive Plan, Directors Stock Plan and Long-Term Performance Plan        
Stock-Based Compensation Plans - Disclosures        
Options granted (in shares)     0  
Awards or units granted (in shares)     0  
Amended and Restated 2010 Stock Incentive Plan and 2005 Directors Stock Plan        
Stock-Based Compensation Plans - Disclosures        
Number of shares that will be granted       0