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Reportable Business Segments and International Operations (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income	$ 278.9us-gaap_OperatingIncomeLoss	$ 267.8us-gaap_OperatingIncomeLoss	$ 255.8us-gaap_OperatingIncomeLoss	$ 232.1us-gaap_OperatingIncomeLoss	$ 241.4us-gaap_OperatingIncomeLoss	$ 224.5us-gaap_OperatingIncomeLoss	$ 224.0us-gaap_OperatingIncomeLoss	$ 207.0us-gaap_OperatingIncomeLoss	$ 1,034.6us-gaap_OperatingIncomeLoss	$ 896.8us-gaap_OperatingIncomeLoss	$ 828.3us-gaap_OperatingIncomeLoss
Interest expense									(80.4)us-gaap_InterestExpense	(63.6)us-gaap_InterestExpense	(59.6)us-gaap_InterestExpense
Interest Income									20.2us-gaap_InterestIncomeOther	15.0us-gaap_InterestIncomeOther	11.5us-gaap_InterestIncomeOther
Stock-based compensation expense									(41.4)	(36.1)	(31.4)
Acquisition-related expenses	(1.8)	(2.5)		(2.0)	(3.4)	(2.5)			(14.1)	(6.0)	(2.0)
Income before income taxes									972.5	846.6	778.8
Operating Segment
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income									1,131.7	977.3	899.2
Unallocated amount to segment
Reconciliation of segment operating income to consolidated income before income taxes
Interest expense									(80.4)	(63.6)	(59.6)
Interest Income									20.2	15.0	11.5
Stock-based compensation expense									(41.4)	(36.1)	(31.4)
Acquisition-related expenses									(14.1)	(6.0)	(2.0)
Other costs, net									(43.5)	(40.0)	(38.9)
Income before income taxes									$ 972.5	$ 846.6	$ 778.8