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Stock-Based Compensation Plans - Stock-Based Awards (Details) - USD ($)
shares in Millions, $ in Millions
6 Months Ended 174 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
May 19, 2020
May 20, 2014
Stock-Based Compensation Plans          
Stock-Based Compensation Plans - Disclosures          
Compensation cost $ 47.3 $ 44.4      
Related income tax benefit 9.3 9.3      
Capitalized as part of an asset $ 0.8 $ 1.0      
Amended and Restated 2010 Stock Incentive Plan and 2005 Directors Stock Plan          
Stock-Based Compensation Plans - Disclosures          
Number of shares that will be granted         0.0
2014 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 2020 Directors Stock Plan          
Stock-Based Compensation Plans - Disclosures          
Maximum number of new shares of common stock available for grant (in shares) 3.9   3.9