Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012 product segment	Jul. 03, 2011	Dec. 31, 2011
Segment Information
Number of geographic segments			3
Segment information
Net sales	$ 371.1	$ 375.7	$ 735.3	$ 705.6
Operating income (loss)	33.7	26.6	60.6	49.5
Interest income	0.2	0.2	0.4	0.5
Interest expense	(6.1)	(6.7)	(12.3)	(12.6)
Other		(0.6)	0.9	(0.7)
Income from continuing operations before income taxes	27.8	19.5	49.6	36.7
Capital Expenditures	4.7	5.4	9.6	12.0
Depreciation and Amortization	12.5	14.1	25.1	25.4
Identifiable Assets (at year end)	1,631.3	1,880.4	1,631.3	1,880.4	1,697.5
Property, plant and equipment, net (at year end)	212.1	252.2	212.1	252.2	226.7
Intersegment sales	38.5	40.3	73.6	73.8
Assets held for sale	14.7		14.7		4.6
Number of product categories			4
Residential & commercial flow control
Segment information
Net sales	211.3	199.2	412.5	365.6
HVAC & gas
Segment information
Net sales	106.8	122.1	216.6	235.6
Drains & water re-use
Segment information
Net sales	35.0	36.6	68.7	67.7
Water quality
Segment information
Net sales	18.0	17.8	37.5	36.7
U.S.
Segment information
Net sales	199.7	192.5	389.7	375.4
Property, plant and equipment, net (at year end)	71.6	78.6	71.6	78.6
Reportable Segments
Segment information
Operating income (loss)	40.8	34.1	75.2	71.3
North America
Segment information
Net sales	221.8	212.0	431.8	414.1
Operating income (loss)	26.7	26.3	46.9	53.0
Capital Expenditures	1.8	1.9	4.4	5.3
Depreciation and Amortization	5.2	5.2	10.0	9.6
Identifiable Assets (at year end)	790.0	844.9	790.0	844.9
Property, plant and equipment, net (at year end)	73.7	83.8	73.7	83.8
Intersegment sales	1.2	0.8	2.6	1.7
Assets held for sale	14.7	3.8	14.7	3.8
EMEA
Segment information
Net sales	142.8	157.8	292.0	281.8
Operating income (loss)	12.0	6.9	24.8	16.6
Capital Expenditures	2.4	3.2	4.6	6.3
Depreciation and Amortization	6.8	8.4	14.1	14.8
Identifiable Assets (at year end)	750.5	948.8	750.5	948.8
Property, plant and equipment, net (at year end)	123.9	153.1	123.9	153.1
Intersegment sales	2.0	2.3	4.6	4.2
Asia
Segment information
Net sales	6.5	5.9	11.5	9.7
Operating income (loss)	2.1	0.9	3.5	1.7
Capital Expenditures	0.5	0.3	0.6	0.4
Depreciation and Amortization	0.5	0.5	1.0	1.0
Identifiable Assets (at year end)	90.8	85.1	90.8	85.1
Property, plant and equipment, net (at year end)	14.5	15.3	14.5	15.3
Intersegment sales	35.3	37.2	66.4	67.9
Assets held for sale		6.2		6.2
Corporate
Segment information
Operating income (loss)	(7.1)	(7.5)	(14.6)	(21.8)
Discontinued operations
Segment information
Identifiable Assets (at year end)		$ 1.6		$ 1.6