Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 5.4	$ 5.4	$ 5.4
Charged to Costs and Expenses	5.4	2.8	3.9
Deductions	(5.1)	(2.8)	(3.9)
Balance at End of Period	5.7	5.4	5.4
Reserve for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	5.1	4.4	4.5
Charged to Costs and Expenses	36.2	35.0	33.2
Deductions	(36.2)	(34.3)	(33.3)
Balance at End of Period	$ 5.1	$ 5.1	$ 4.4