Accounts and Other Receivables (Narrative) (Details) - Residential Products $ in Millions	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Receivables from a customer that is experiencing financial difficulty and liquidity problems	$ 26.7
Reserve for probable credit loss	15.9
Notes Receivable
Segment Reporting Information [Line Items]
Reserve for probable credit loss	15.0
Trade accounts receivable
Segment Reporting Information [Line Items]
Reserve for probable credit loss	$ 0.9