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Presentation of Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Changes [Line Items]                      
Revenue $ 4,086.7 $ 3,714.3 $ 3,859.6 $ 3,629.6 $ 4,176.6 $ 3,719.5 $ 3,790.1 $ 3,587.4 $ 15,290.2 $ 15,273.6 $ 15,416.9
Operating Expenses 3,459.5 3,212.0 3,277.3 3,207.9 3,550.1 3,249.3 3,218.6 3,171.7 13,156.7 13,189.8 13,386.4
Operating Profit $ 627.2 $ 502.3 $ 582.3 $ 421.7 626.5 $ 470.2 $ 571.5 $ 415.7 2,133.5 2,083.8 2,030.5
Cumulative effect of accounting changes         24.0         24.0 (27.1)
Interest Expense                 266.4 248.6 231.3
Accounting Standards Update 2017-07 [Member]                      
Accounting Changes [Line Items]                      
Interest Expense                 24.5 24.1 21.6
Retained Earnings                      
Accounting Changes [Line Items]                      
Cumulative effect of accounting changes         23.6         23.6 $ (31.6)
Retained Earnings | Accounting Standards Update 2014-09 [Member]                      
Accounting Changes [Line Items]                      
Cumulative effect of accounting changes         19.5         19.5  
Retained Earnings | Accounting Standards Update 2016-01 [Member]                      
Accounting Changes [Line Items]                      
Cumulative effect of accounting changes         $ 4.1         $ 4.1  
Adjustments                      
Accounting Changes [Line Items]                      
Revenue                 146.1    
Operating Expenses                 139.5    
Operating Profit                 6.6    
Excluding Impact of Adoption of ASC 606                      
Accounting Changes [Line Items]                      
Revenue                 15,436.3    
Operating Expenses                 13,296.2    
Operating Profit                 $ 2,140.1