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Acquisitions (Narrative - BlueLine Acquisition) (Details)
1 Months Ended
Oct. 31, 2018
USD ($)
employee
location
state
Dec. 31, 2019
BlueLine    
Business Acquisition [Line Items]    
Revenue reported by acquired entity for last annual period $ 786,000,000  
Consideration transferred $ 2,069,000,000.000  
BlueLine    
Business Acquisition [Line Items]    
Number of branch locations | location 114  
Number of entity employees | employee 1,700  
Number of states in which entity operates | state 25  
Line of credit    
Business Acquisition [Line Items]    
Line of credit facility, maximum borrowing capacity $ 1,000,000,000  
Senior Notes 6.5 Percent | Senior notes    
Business Acquisition [Line Items]    
Stated interest rate   6.50%
Senior Notes 6.5 Percent | Senior notes | BlueLine    
Business Acquisition [Line Items]    
Stated interest rate 6.50%  
Senior Notes 6.5 Percent | Senior notes | BlueLine    
Business Acquisition [Line Items]    
Debt instrument, face amount $ 1,100,000,000