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Commitments and Contingencies - Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Operating lease expenses $ 41.4 $ 32.3 $ 25.5
Operating leases future minimum lease payments [Abstract]      
2016 27.3    
2017 23.3    
2018 20.8    
2019 18.4    
2020 16.5    
Thereafter 40.3    
Total $ 146.6