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FAIR VALUE MEASUREMENT - Assets (liabilities) measured at fair value on recurring basis (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Financial Instruments  
Assets transfer out of Level 1 into Level 2 $ 0.0
Assets transfer out of Level 2 into Level 1 0.0
Liabilities transfer out of Level 1 into Level 2 0.0
Liabilities transfer out of Level 2 into Level 1 0.0
Assets transfers into Level 3 fair value measurements 0.0
Assets transfers out of Level 3 fair value measurements 0.0
Liabilities transfers into Level 3 fair value measurements 0.0
Liabilities transfers out of Level 3 fair value measurements 0.0
Recurring basis  
Financial Instruments  
Available-for-sale investments 188.0
Financial assets 207.6
Recurring basis | Level 1  
Financial Instruments  
Available-for-sale investments 188.0
Financial assets 188.0
Recurring basis | Level 2  
Financial Instruments  
Financial assets 19.6
Recurring basis | TRS  
Financial Instruments  
Financial assets 0.6
Recurring basis | TRS | Level 2  
Financial Instruments  
Financial assets 0.6
Foreign currency forward and collar contracts | Recurring basis  
Financial Instruments  
Financial assets 6.1
Foreign currency forward and collar contracts | Recurring basis | Level 2  
Financial Instruments  
Financial assets 6.1
Energy swap contracts | Recurring basis  
Financial Instruments  
Financial assets 12.9
Energy swap contracts | Recurring basis | Level 2  
Financial Instruments  
Financial assets $ 12.9