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Stock-Based Compensation Plans - Stock-Based Awards (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 171 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
May 20, 2014
Stock-Based Compensation Plans        
Stock-Based Compensation Plans - Disclosures        
Compensation cost $ 23.5 $ 24.3    
Related income tax benefit 4.9 4.8    
Capitalized as part of an asset $ 0.4 $ 0.6    
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) 4.0   4.0