Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013 item	Jul. 01, 2012	Dec. 31, 2012
Segment Information
Number of geographic segments			3
Segment information
Net sales	$ 371.3	$ 367.4	$ 733.4	$ 728.6
Operating income (loss)	35.6	33.2	63.9	59.8
Interest income	0.2	0.2	0.3	0.4
Interest expense	(5.5)	(6.1)	(11.5)	(12.3)
Other income (expense), net	(1.4)		(1.4)	0.9
Income from continuing operations before income taxes	28.9	27.3	51.3	48.8
Capital Expenditures	7.0	4.7	18.0	9.6
Depreciation and Amortization	12.3	12.2	24.7	24.8
Identifiable Assets (at end of period)	1,635.8	1,631.3	1,635.8	1,631.3	1,709.0
Property, plant and equipment, net (at end of period)	221.7	212.1	221.7	212.1	223.6
Intersegment sales	51.2	38.5	96.8	73.6
Number of product categories			4
Residential & commercial flow control
Segment information
Net sales	209.2	207.5	409.6	405.7
HVAC & gas
Segment information
Net sales	107.0	106.9	214.7	216.6
Drains & water re-use
Segment information
Net sales	36.3	35.0	70.2	68.8
Water quality
Segment information
Net sales	18.8	18.0	38.9	37.5
Discontinued operations
Segment information
Identifiable Assets (at end of period)		10.9		10.9
Reportable Segments
Segment information
Operating income (loss)	43.7	40.3	81.2	74.4
North America
Segment information
Net sales	224.4	218.1	437.4	425.1
Operating income (loss)	31.5	26.2	55.5	46.1
Capital Expenditures	4.6	1.8	12.8	4.4
Depreciation and Amortization	5.1	4.9	10.1	9.7
Identifiable Assets (at end of period)	743.0	779.1	743.0	779.1
Property, plant and equipment, net (at end of period)	86.0	73.7	86.0	73.7
Intersegment sales	1.3	1.2	2.6	2.6
Assets held for sale		3.8		3.8
North America | U.S.
Segment information
Net sales	201.6	196.0	394.4	383.0
Property, plant and equipment, net (at end of period)	81.0	68.2	81.0	68.2
EMEA
Segment information
Net sales	138.6	142.8	281.0	292.0
Operating income (loss)	9.8	12.0	20.4	24.8
Capital Expenditures	2.1	2.4	4.3	4.6
Depreciation and Amortization	6.6	6.8	13.3	14.1
Identifiable Assets (at end of period)	812.7	750.5	812.7	750.5
Property, plant and equipment, net (at end of period)	121.1	123.9	121.1	123.9
Intersegment sales	2.4	2.0	5.1	4.6
Asia
Segment information
Net sales	8.3	6.5	15.0	11.5
Operating income (loss)	2.4	2.1	5.3	3.5
Capital Expenditures	0.3	0.5	0.9	0.6
Depreciation and Amortization	0.6	0.5	1.3	1.0
Identifiable Assets (at end of period)	80.1	90.8	80.1	90.8
Property, plant and equipment, net (at end of period)	14.6	14.5	14.6	14.5
Intersegment sales	47.5	35.3	89.1	66.4
Corporate
Segment information
Operating income (loss)	$ (8.1)	$ (7.1)	$ (17.3)	$ (14.6)