Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Line Items]
Effective tax rate (as a percent)	26.50%	26.80%	26.70%	26.60%
Effective tax rate excluding the net impact of acquisition-related expenses (as a percent)	26.50%	26.50%	26.50%	26.50%
Unrecognized tax benefits, anticipated adjustment for changing facts and circumstances, over the next twelve month period	$ 3.7		$ 3.7
Accrued pension benefit obligations and other long-term liabilities
Income Taxes [Line Items]
Liability for unrecognized tax benefits, which if recognized would impact the effective tax rate	$ 19.8		$ 19.8