Liabilities - Other Liabilities (Details) - USD ($) $ in Millions	36 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Other liabilities
Contributions to deferred compensation plan	$ 0.0
Other Assets
Other liabilities
Deferred compensation plan assets	1.9	$ 2.7
Other Liabilities
Other liabilities
Deferred compensation plan liabilities	2.3	3.1
Medical and dental benefits	2.0
Asset retirement obligations	3.2	3.2
Income taxes payable	$ 1.0	$ 1.0

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(b)(1))
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Amount of liabilities for medical and dental benefits classified as other, due after one year or the normal operating cycle, if longer

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