Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowances for doubtful accounts receivable:
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 2.1	$ 3.2	$ 3.0
Additions / (Reversals) Charged to Costs and Expenses	1.6	(0.2)	1.4
Deductions	(0.3)	(0.9)	(1.2)
Acquisitions	0	0	0
Balance at End of Year	3.4	2.1	3.2
Allowance for credit memos, returns and cash discounts:
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	31.6	22.9	22.8
Additions / (Reversals) Charged to Costs and Expenses	222.4	208.0	192.5
Deductions	(217.3)	(199.3)	(192.4)
Acquisitions	0	0	0
Balance at End of Year	36.7	31.6	22.9
Valuation allowance on deferred tax assets:
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	28.5	26.1	19.7
Additions / (Reversals) Charged to Costs and Expenses	4.5	2.6	6.4
Deductions	0	(0.2)	0
Acquisitions	1.3	0	0
Balance at End of Year	$ 34.3	$ 28.5	$ 26.1