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Commitments and Contingencies - Bonds, Leases, and Sales and Purchase Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Surety Bonds      
Outstanding bonds $ 39.1 $ 38.7  
Future minimum lease payments under non-cancelable operating leases      
2016 42.1    
2017 31.3    
2018 23.4    
2019 18.8    
2020 15.1    
Thereafter 45.5    
Total future minimum lease payment 176.2    
Rental expenses for properties and equipment 31.6 $ 29.2 $ 24.7
Minimum sublease rentals 37.5    
Sales and Purchase Commitments      
Sales commitments under derivative programs 270.2    
Purchase commitments under derivative programs $ 65.9