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Derivatives and Financial Instruments - Schedule of Changes in Level 3 Instruments (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at January 1 $ 0.9
Payments made during year (0.5)
Balance at December 31 0.4
Total losses for the period included in profit and loss for assets held at the end at March 31 0.0
Change in unrealized (gains) or losses for the period included in profit and loss for assets held at the end at March 31, $ 0.0