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Debt and Finance Lease Obligations - Components of Debt - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
Dec. 31, 2019
USD ($)
group
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Number of borrowing groups | group   4    
Outstanding principal amount   $ 8,512.5 $ 6,710.7  
Convertible Debt | Convertible Notes        
Debt Instrument [Line Items]        
Conversion ratio (in dollars per share)   6.70%    
Outstanding principal amount   $ 402.5 0.0  
Unsecured Debt | Vendor Financing Obligations        
Debt Instrument [Line Items]        
General term of vendor financing arrangements for amounts due   1 year    
Operating expenses financed by intermediary   $ 130.0 $ 172.0 $ 83.0
Senior Notes        
Debt Instrument [Line Items]        
Mandatory redemption price expressed as percentage of principal amount on senior notes in event that certain assets sold or specific control changed   101.00%    
Redemption price 103.00%