Background and Basis of Presentation - Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Senior notes | 2021 Senior Notes (5.25% fixed rate) due May 2021
Fair Value of Financial Instruments
Fixed rate of interest (as a percent)	5.25%
Secured debt | German loan agreement (2.45% fixed rate) due in 32 equal quarterly installments ending September 2022
Fair Value of Financial Instruments
Fixed rate of interest (as a percent)	2.45%
Carrying Value
Fair Value of Financial Instruments
Total debt	$ 229.9	$ 224.7
Carrying Value | Senior notes | 2021 Senior Notes (5.25% fixed rate) due May 2021
Fair Value of Financial Instruments
Total debt	175.0	175.0
Carrying Value | Secured debt | Global Revolving Credit Facilities (variable rates) due December 2019
Fair Value of Financial Instruments
Total debt	48.3	42.9
Carrying Value | Secured debt | German loan agreement (2.45% fixed rate) due in 32 equal quarterly installments ending September 2022
Fair Value of Financial Instruments
Total debt	6.6	6.8
Level 2 | Fair Value
Fair Value of Financial Instruments
Total debt	224.5	219.2
Level 2 | Fair Value | Senior notes | 2021 Senior Notes (5.25% fixed rate) due May 2021
Fair Value of Financial Instruments
Total debt	169.6	169.5
Level 2 | Fair Value | Secured debt | Global Revolving Credit Facilities (variable rates) due December 2019
Fair Value of Financial Instruments
Total debt	48.3	42.9
Level 2 | Fair Value | Secured debt | German loan agreement (2.45% fixed rate) due in 32 equal quarterly installments ending September 2022
Fair Value of Financial Instruments
Total debt	$ 6.6	$ 6.8