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Receivables (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Receivables    
Trade accounts receivable $ 1,074.9 $ 800.0
Less allowance for doubtful accounts (6.2) (7.0)
Net trade accounts receivable 1,068.7 793.0
Other receivables 123.3 164.1
Receivables, net 1,192.0 957.1
Maximum available sale of the accounts receivables under factoring program 481.0  
Amount of sale of receivables $ 350.9 $ 197.6