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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	May 31, 2013
Marketable securities
Cost of marketable securities	$ 4.4
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%			5.25%
Secured debt \| Second German Loan Agreement (2.45% fixed rate) due in quarterly installments ending September 2022
Fair Value of Financial Instruments
Fixed rate of interest (as a percent)	2.45%
Secured debt \| Third German Loan Agreement (1.45% fixed rate)
Fair Value of Financial Instruments
Fixed rate of interest (as a percent)	1.45%		1.45%
Carrying Value
Fair Value of Financial Instruments
Debt fair value	$ 203.8	$ 242.6
Carrying Value \| Senior notes \| 2021 Senior Notes (5.25% fixed rate) due May 2021
Fair Value of Financial Instruments
Debt fair value	175.0	175.0
Carrying Value \| Line of credit \| Global Revolving Credit Facilities (variable rates) due December 2023
Fair Value of Financial Instruments
Debt fair value	21.6	57.9
Carrying Value \| Secured debt \| Second German Loan Agreement (2.45% fixed rate) due in quarterly installments ending September 2022
Fair Value of Financial Instruments
Debt fair value	3.5	4.8
Carrying Value \| Secured debt \| Third German Loan Agreement (1.45% fixed rate)
Fair Value of Financial Instruments
Debt fair value	3.7	4.9
Fair Value \| Level 2
Fair Value of Financial Instruments
Debt fair value	203.2	238.4
Fair Value \| Level 2 \| Senior notes \| 2021 Senior Notes (5.25% fixed rate) due May 2021
Fair Value of Financial Instruments
Debt fair value	174.3	170.5
Fair Value \| Level 2 \| Line of credit \| Global Revolving Credit Facilities (variable rates) due December 2023
Fair Value of Financial Instruments
Debt fair value	21.6	57.9
Fair Value \| Level 2 \| Secured debt \| Second German Loan Agreement (2.45% fixed rate) due in quarterly installments ending September 2022
Fair Value of Financial Instruments
Debt fair value	3.6	5.1
Fair Value \| Level 2 \| Secured debt \| Third German Loan Agreement (1.45% fixed rate)
Fair Value of Financial Instruments
Debt fair value	$ 3.7	$ 4.9