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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 29, 2015
Dec. 31, 2014
Trade accounts receivable, allowance for doubtful accounts (in dollars) $ 10.3us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 10.6us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred Stock, par value (in dollars per share) $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Class A    
Common Stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock, shares authorized 80,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
80,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock, votes per share (Number of votes) 1wts_CommonStockVotePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
1wts_CommonStockVotePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock, issued shares 28,411,252us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
28,552,065us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock, outstanding shares 28,411,252us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
28,552,065us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B    
Common Stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock, shares authorized 25,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
25,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock, votes per share (Number of votes) 10wts_CommonStockVotePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
10wts_CommonStockVotePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock, issued shares 6,479,290us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
6,479,290us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock, outstanding shares 6,479,290us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
6,479,290us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember