Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 178.1	$ 116.2
Other comprehensive income (loss):
Change in derivative instruments designated as cash flow hedges, net of tax	6.6	(9.2)
Foreign currency translation adjustments	4.6	1.6
Benefit plan adjustments, net of tax	2.2	1.7
Other comprehensive income (loss)	13.4	(5.9)
Comprehensive income	$ 191.5	$ 110.3