LM acquired 15% of the equity share capital of ST on 1 January 20X6 for...

LM acquired 15% of the equity share capital of ST on 1 January 20X6 for $18 million.  LM acquired a further 50% of the equity share capital of ST for $50 million on 1 January 20X7 when the fair value of ST's net assets was $82 million.  The original 15% investment in ST had a fair value of $20 million at 1 January 20X7.  The non controlling interest in ST was measured at its fair value of $30 million at the date control in ST was acquired.  

Calculate the goodwill arising on the acquisition of ST that LM included in its consolidated financial statements at 31 December 20X7.

Give your answer to the nearest $ million.

$ ?  million