Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 197.0	$ 197.7
Less: unamortized debt issuance costs	0.6	0.7
Long-term Debt	196.4	197.0
Debt, current	0.0	0.0
Long-term debt, excluding current portion	196.4	197.0
Revolving credit facility, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	28.9	29.6
Line of credit facility, current borrowing capacity	300.0
Line of credit facility outstanding borrowings, Yen	4.5
Line of credit facility outstanding borrowings, Euro	24.4
Letters of credit outstanding	2.8
Line of credit facility, remaining borrowing capacity	268.3
Notes payable, Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0.1	0.1
Series A Notes, Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	42.0	42.0
Series B Notes, Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	53.0	53.0
Series C Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 73.0	$ 73.0