CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 641.8	$ 621.0	$ 309.1
Other comprehensive (loss) income:
Foreign currency translation (loss) gain	(25.7)	28.8	(5.7)
Pension and postretirement benefit adjustments, net of tax	0.1	4.3	0.7
Total other comprehensive (loss) income	(25.6)	33.1	(5.0)
Comprehensive income	616.2	654.1	304.1
Less: Comprehensive income attributable to noncontrolling interests	8.1	7.6	4.8
Comprehensive income attributable to Reliance	$ 608.1	$ 646.5	$ 299.3