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Stock-Based Compensation Plans - Stock-Based Awards (Details) - USD ($)
shares in Millions, $ in Millions
6 Months Ended 162 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
May 20, 2014
Stock-Based Compensation Plans        
Stock-Based Compensation Plans - Disclosures        
Compensation cost $ 44.4 $ 42.7    
Related income tax benefit 9.3 9.3    
Capitalized as part of an asset $ 1.0 $ 1.1    
Amended and Restated 2010 Stock Incentive Plan and 2005 Directors Stock Plan        
Stock-Based Compensation Plans - Disclosures        
Number of shares that will be granted       0.0
Stock Incentive Plan and Directors Stock Plan        
Stock-Based Compensation Plans - Disclosures        
Options granted (in shares)     0.0  
Awards or units granted (in shares)     0.0  
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) 6.8   6.8