Related Party Transactions (Narrative) (Details) - Methvin Company [Member] - Director [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 29.6	$ 21.7	$ 16.6
Accounts Receivable, Related Parties, Current	3.8	$ 1.9
Related Party Transaction, Amounts of Transaction	$ 0.2

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant