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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Vendor and Customer Rebates and Allowances [Abstract]
Vendor rebates and allowances	$ 3.3		$ 3.3		$ 6.1
Customer Rebates and Allowances	26.5		26.5		$ 24.7
Operating Leases, Rent Expense, Net [Abstract]
Rental expense	4.5	$ 4.6	$ 9.0	$ 8.5
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Single Customer [Member]
Risks and Uncertainties [Abstract]
Concentration of credit risk			13.00%		11.00%
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
6.375% senior notes, book value	300.0		$ 300.0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
6.375% senior notes, book value	315.7		315.7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Money market funds, fair value	$ 156.0		$ 156.0		$ 137.6

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