Stock-Based Compensation (Share-Based Compensation Expense by Line Item) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ (15.7)	$ (16.4)	$ (9.2)
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	(5.7)	(5.9)	(3.3)
Allocated Share-based Compensation Expense, Net of Tax	(10.0)	(10.5)	(5.9)
Advertising, selling, general and administrative expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ (15.7)	$ (16.4)	$ (9.2)