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Presentation of Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounting Changes [Line Items]          
Revenue $ 3,859.6 $ 3,790.1 $ 7,489.2 $ 7,377.6  
Operating Expenses 3,277.3 3,218.6 6,485.3 6,390.4  
Operating Income (Loss) 582.3 571.5 1,003.9 987.2  
Interest Expense 66.4 $ 62.8 128.6 121.9  
Accounting Standards Update 2017-07 [Member]          
Accounting Changes [Line Items]          
Interest Expense     12.3 $ 11.7  
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 49.0   91.4    
Operating Expenses 41.5   77.4    
Operating Income (Loss) 7.5   14.0    
Amounts without the Adoption of ASC 606          
Accounting Changes [Line Items]          
Revenue 3,908.6   7,580.6    
Operating Expenses 3,318.8   6,562.7    
Operating Income (Loss) $ 589.8   $ 1,017.9