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Organization, Description of Business and Basis of Presentation - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Number of reportable segments (in segments) | segment     2    
Share-based compensation, excess tax benefit     $ 9.8    
Total minimum lease payments         $ 2,144.3
Reclassification of net periodic benefit cost $ (3,700.3) $ (3,545.0) $ (10,701.5) $ (10,541.3)  
Pro Forma | Accounting Standards Update 2017-07          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reclassification of net periodic benefit cost         $ 25.0