Revenue (Summary of Receivables and Contract Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 280.2	$ 349.7
Allowances	66.6	93.0
Contract liabilities	$ 51.0	$ 84.4

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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