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Reportable Business Segments and International Operations - Reconciliation of Segment Operating Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income	$ 289.0	$ 294.8	$ 260.7	$ 260.2	$ 278.9	$ 267.8	$ 255.8	$ 232.1	$ 1,104.7	$ 1,034.6	$ 896.8
Interest expense									(68.3)	(80.4)	(63.6)
Interest Income									18.4	20.2	15.0
Stock-based compensation expense									(44.2)	(41.4)	(36.1)
Acquisition-related expenses									(5.7)	(14.1)	(6.0)
Income before income taxes									1,052.8	972.5	846.6
Operating Segment
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income									1,198.6	1,131.7	977.3
Segment Reconciliation Items
Reconciliation of segment operating income to consolidated income before income taxes
Interest expense									(68.3)	(80.4)	(63.6)
Interest Income									18.4	20.2	15.0
Stock-based compensation expense									(44.2)	(41.4)	(36.1)
Acquisition-related expenses									(5.7)	(14.1)	(6.0)
Other costs, net									(46.0)	(43.5)	(40.0)
Income before income taxes									$ 1,052.8	$ 972.5	$ 846.6