Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 138.1	$ 81.5	$ 298.8	$ 254.3
Other comprehensive income (loss):
Foreign currency translation adjustment, net of income taxes of $0.7 and $(0.1) for the three months ended September 30, 2020 and 2019, respectively, and $(4.1) and $(1.1) for the nine months ended September 30, 2020 and 2019, respectively	19.5	(24.0)	(20.4)	(18.7)
Total other comprehensive income (loss)	16.4	(24.0)	(17.2)	(20.6)
Unrealized (loss) gain on derivatives, net of income taxes of $(0.1) and $— for the three months ended September 30, 2020 and 2019, respectively, and $(0.4) and $— for the nine months ended September 30, 2020 and 2019, respectively	(3.1)		3.2	(1.9)
Total comprehensive income	$ 154.5	$ 57.5	$ 281.6	$ 233.7