Revenue Reserves (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total reserves	$ 468.6	$ 416.3	$ 237.1	$ 155.6
Reduction of accounts receivable
Total reserves	124.6	151.4
Component of accrued expenses and other
Total reserves	$ 344.0	$ 264.9