This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

Quarterly Financial Information (unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales		$ 376.5us-gaap_SalesRevenueNet	$ 376.0us-gaap_SalesRevenueNet	$ 396.0us-gaap_SalesRevenueNet	$ 365.2us-gaap_SalesRevenueNet		$ 376.0us-gaap_SalesRevenueNet	$ 371.8us-gaap_SalesRevenueNet	$ 366.8us-gaap_SalesRevenueNet	$ 358.9us-gaap_SalesRevenueNet	$ 1,513.7us-gaap_SalesRevenueNet	$ 1,473.5us-gaap_SalesRevenueNet	$ 1,427.4us-gaap_SalesRevenueNet
Gross profit		131.4us-gaap_GrossProfit	138.1us-gaap_GrossProfit	139.0us-gaap_GrossProfit	133.3us-gaap_GrossProfit		130.9us-gaap_GrossProfit	133.9us-gaap_GrossProfit	132.8us-gaap_GrossProfit	128.9us-gaap_GrossProfit	541.8us-gaap_GrossProfit	526.5us-gaap_GrossProfit	513.5us-gaap_GrossProfit
Income from continuing operations		(7.7)	22.6	21.3	14.1		8.2	17.5	18.9	16.3
Net income		(7.7)	22.6	21.3	14.1		8.2	15.4	18.9	16.1	50.3	58.6	68.4
BASIC EPS
Income from continuing operations (in dollars per share)		$ (0.22)	$ 0.64	$ 0.60	$ 0.40		$ 0.23	$ 0.49	$ 0.53	$ 0.46	$ 1.42	$ 1.72	$ 1.96
Net income (in dollars per share)		$ (0.22)us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic		$ 0.23us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 1.42us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 1.90us-gaap_EarningsPerShareBasic
DILUTED EPS
Income from continuing operations (in dollars per share)		$ (0.22)	$ 0.64	$ 0.60	$ 0.40		$ 0.23	$ 0.49	$ 0.53	$ 0.46	$ 1.42	$ 1.71	$ 1.95
Net income (in dollars per share)		$ (0.22)us-gaap_EarningsPerShareDiluted	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted		$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.43us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 1.42us-gaap_EarningsPerShareDiluted	$ 1.65us-gaap_EarningsPerShareDiluted	$ 1.90us-gaap_EarningsPerShareDiluted
Dividends declared per common share (in dollars per share)		$ 0.15	$ 0.15	$ 0.15	$ 0.13		$ 0.13	$ 0.13	$ 0.13	$ 0.11	$ 0.58	$ 0.50	$ 0.44
Net settlement expense recorded for Trabakoolas et al., v. Watts Water Technologies litigation						13.6us-gaap_LitigationSettlementExpense
Impairment charges on Indefinite lived trade names											1.3	0.7	0.4
Restructuring expense	8.0										15.2	8.7	4.2
Customer rebate expense						3.0
Aerco
DILUTED EPS
Acquisition costs	4.5
Trade name
DILUTED EPS
Impairment charges on Indefinite lived trade names	1.3
Asia Pacific
DILUTED EPS
Goodwill Impairment Charge	12.9
Europe Middle East and Africa and Americas [Member]
DILUTED EPS
Deployment costs	$ 3.5