Summary of Significant Accounting Policies Environmental Costs (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Site Contingency [Line Items]
Accrued Environmental Loss Contingencies, Noncurrent	$ 18.7	$ 23.4

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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