Financing Arrangements - Credit Agreement (Details)						12 Months Ended
	Dec. 20, 2016 USD ($)	Dec. 16, 2016 USD ($)	Nov. 01, 2016 USD ($)	Apr. 28, 2016 USD ($)	Feb. 12, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 29, 2017 EUR (€)	Jun. 30, 2017 EUR (€)	Dec. 16, 2016 EUR (€)
Credit Agreement
Total long-term debt						$ 511,300,000	$ 574,200,000
Stand-by letters of credit outstanding						25,600,000	$ 24,800,000
5.85% Senior notes due 2016
Credit Agreement
Interest rate (as a percent)				5.85%			5.85%
Repayment of debt				$ 225,000,000
Prior Credit Agreement
Credit Agreement
Multi-currency borrowing capacity							$ 500,000,000
Term of debt							5 years
Potential additional borrowing capacity							$ 500,000,000
Sublimit on letters of credit							$ 100,000,000
Credit Agreement
Credit Agreement
Term of debt					5 years
Sublimit on letters of credit					$ 100,000,000
Amount drawn				$ 230,000,000
Unused and available credit under the credit agreement						312,400,000
Stand-by letters of credit outstanding						$ 25,600,000
Eurocurrency rate loans | LIBOR | Minimum
Credit Agreement
Interest rate added to base rate (as a percent)						0.975%
Eurocurrency rate loans | LIBOR | Maximum
Credit Agreement
Interest rate added to base rate (as a percent)						1.45%
Base rate loans and swing line loans | LIBOR
Credit Agreement
Interest rate added to base rate (as a percent)						1.00%
Base rate loans and swing line loans | LIBOR | Minimum
Credit Agreement
Interest rate added to base rate (as a percent)						0.00%
Base rate loans and swing line loans | LIBOR | Maximum
Credit Agreement
Interest rate added to base rate (as a percent)						0.45%
Base rate loans and swing line loans | Federal funds
Credit Agreement
Interest rate added to base rate (as a percent)						0.50%
Senior unsecured revolving credit facility
Credit Agreement
Multi-currency borrowing capacity					$ 500,000,000
Interest rate on revolving credit facility (as a percent)						1.94%
Repayment of debt	$ 113,000,000
Senior unsecured revolving credit facility | 5.85% Senior notes due 2016
Credit Agreement
Amount drawn			$ 45,000,000
Term loan facility | Term Loan due February 2021
Credit Agreement
Term of debt					5 years
Face amount					$ 300,000,000
Interest rate on term loan facility (as a percent)						2.13%
First year (as a percent)					0.00%
Second and third years (as a percent)					7.50%
Fourth and fifth years (as a percent)					10.00%
Term loan facility | LIBOR | Minimum | Term Loan due February 2021
Credit Agreement
Interest rate added to base rate (as a percent)						1.125%
Term loan facility | LIBOR | Maximum | Term Loan due February 2021
Credit Agreement
Interest rate added to base rate (as a percent)						1.75%
Facility Agreement | Watts International
Credit Agreement
Multi-currency borrowing capacity | €										€ 110,000,000
Term of debt		364 days
Frequency of interest payment, first option		1 month
Frequency of interest payment, second option		2 months
Frequency of interest payment, third option		3 months
Required payment | €								€ 15,000,000	€ 15,000,000
Facility Agreement | Euro Libor | Watts International
Credit Agreement
Minimum base rate (as a percent)		$ 0
Interest rate added to base rate (as a percent)		1.875%