SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Receivable Reserves - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves
Balance at beginning of period	$ 20.2	$ 12.0	$ 10.4
Charged to cost and expenses	3.7	9.7	3.6
Additions (Deductions)	1.7	(1.5)	(2.0)
Balance at end of period	$ 25.6	$ 20.2	$ 12.0