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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Future minimum lease payments required under leasing arrangements      
2016 $ 27.1    
2017 20.0    
2018 14.0    
2019 9.2    
2020 7.8    
Thereafter 13.1    
Rental expense under operating leases $ 47.0 $ 44.5 $ 23.7