Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 643.0	$ 523.1	$ 425.1
Unrealized gain from hedge accounting, net	(5.9)	(0.1)	0.0
Reclassification of hedge accounting gain to net income, net of tax	3.9	0.3	0.0
Foreign currency translation, net	(32.7)	43.7	(78.7)
Other comprehensive (loss) income, net of tax	(34.7)	43.9	(78.7)
Comprehensive income	$ 608.3	$ 567.0	$ 346.4