Prepaid Expenses and Other (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 53.4	$ 63.5
Mobile airtime inventory	13.3	15.8
Income tax receivable	19.7	28.3
Other	14.9	21.4
Prepaid expenses and other	$ 101.3	$ 129.0