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Guarantees, Commitments and Contingencies, Rent Expense (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
site
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]      
Capital lease sites | site 1    
Operating leases rent expense $ 40.0 $ 26.1 $ 20.0
Minimum commitments under take-or-pay purchase obligation 1,174.0    
Operating Leases      
2019 36.0    
2020 31.1    
2021 20.4    
2022 17.1    
2023 13.3    
Thereafter 107.1    
Capital Leases      
2019 2.9    
2020 2.9    
2021 3.1    
2022 3.1    
2023 3.1    
Thereafter 4.3    
Building      
Operating Leased Assets [Line Items]      
Capital leases, accumulated amortization 1.9 2.3  
Capital leases, net $ 13.0 $ 16.4