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Organization, Description of Business and Basis of Presentation - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
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 $ 0.8   $ 11.5    
Total minimum lease payments         $ 2,144.3
Reclassification of net periodic benefit cost $ (3,575.3) $ (3,513.0) $ (7,001.2) $ (6,996.3)  
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