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Presentation of Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounting Changes [Line Items]          
Revenue $ 3,714.3 $ 3,719.5 $ 11,203.5 $ 11,097.1  
Operating Expenses 3,212.0 3,249.3 9,697.2 9,639.7  
Operating Income (Loss) 502.3 470.2 1,506.3 1,457.4  
Interest Expense 69.4 $ 65.0 198.1 187.0  
Accounting Standards Update 2017-07 [Member]          
Accounting Changes [Line Items]          
Interest Expense     18.4 $ 17.8  
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]          
Accounting Changes [Line Items]          
Cumulative catch-up adjustment to opening retained earnings         $ 19.5
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]          
Accounting Changes [Line Items]          
Cumulative catch-up adjustment to opening retained earnings         $ 4.1
Adjustments          
Accounting Changes [Line Items]          
Revenue 17.1   108.5    
Operating Expenses 20.7   98.1    
Operating Income (Loss) (3.6)   10.4    
Amounts without the Adoption of ASC 606          
Accounting Changes [Line Items]          
Revenue 3,731.4   11,312.0    
Operating Expenses 3,232.7   9,795.3    
Operating Income (Loss) $ 498.7   $ 1,516.7