Background and Basis of Presentation - Marketable Securities (Details) $ in Millions	Jun. 30, 2020 USD ($)
United States
Marketable securities
Cost of marketable securities	$ 4.5
United States \| Fair Value \| Level 1 \| Other Noncurrent Assets
Marketable securities
Fair value of marketable securities	4.1
Germany \| Pension Benefits
Held to maturity
Investments restricted to the payment of post-retirement employee benefits	2.1
Germany \| Prepaid Expenses and Other Current Assets \| Pension Benefits
Held to maturity
Investments restricted to the payment of post-retirement employee benefits	0.6
Germany \| Other Noncurrent Assets \| Pension Benefits
Held to maturity
Investments restricted to the payment of post-retirement employee benefits	$ 1.5

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant