Other Assets - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Prepaid Expenses and Other Current Assets
Inventories	$ 43.7	$ 38.8
Prepaid expenses	86.3	66.1
Other non-trade receivables	35.2	34.6
Reinsurance receivable	13.1	12.5
Income tax receivable	44.8	78.5
Other current assets	6.8	4.5
Total	$ 229.9	$ 235.0