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Stock-Based Compensation Plans - Stock-Based Awards (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended 156 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
May 20, 2014
Stock-Based Compensation Plans          
Stock-Based Compensation Plans - Disclosures          
Compensation cost $ 78.7 $ 77.5 $ 80.6    
Related income tax benefit 16.8 16.7 27.1    
Capitalized as part of an asset $ 1.7 $ 1.9 $ 2.5    
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) 6.7