Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid expenses	$ 57.9	$ 36.9
Income tax receivable	107.7	121.5
Value added taxes receivable	17.4	13.8
Other current assets	38.6	49.3
Prepaid expenses and other current assets, total	$ 221.6	$ 221.5