Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2021	Aug. 02, 2020	Aug. 01, 2021	Aug. 02, 2020
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 1,297.6	$ 955.9	$ 2,352.7	$ 1,798.0
Pipes, valves & fittings products
Disaggregation of Revenue [Line Items]
Total Net Sales	887.8	621.7	1,592.8	1,160.3
Storm drainage products
Disaggregation of Revenue [Line Items]
Total Net Sales	172.8	142.6	302.5	246.6
Fire protection products
Disaggregation of Revenue [Line Items]
Total Net Sales	137.9	101.0	256.6	209.2
Meter products
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 99.1	$ 90.6	$ 200.8	$ 181.9