Accounts and Other Receivables (Components of Accounts and Other Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current
Trade accounts receivable	$ 571.8	$ 548.8
Trade notes receivable	1.1	1.7
Total trade receivables	572.9	550.5
Other notes receivable	0.0	0.0
Taxes receivable, including income taxes	15.8	12.9
Other receivables	11.7	13.4
Subtotal other receivables	27.5	26.3
Total trade and other receivables	600.4	576.8
Allowance for doubtful accounts: Current
Trade accounts receivable	(8.4)	(5.2)
Trade notes receivable	(0.1)	0.0
Total trade receivables	(8.5)	(5.2)
Other notes receivable	0.0	0.0
Total allowance for doubtful accounts	(8.5)	(5.2)
Total receivables, net	591.9	571.6
Long-term
Trade accounts receivable	0.0	0.0
Trade accounts receivable	0.6	1.4
Total trade receivables	0.6	1.4
Other notes receivable	23.4	24.2
Taxes receivable, including income taxes	0.0	0.0
Other receivables	0.0	0.0
Subtotal other receivables	23.4	24.2
Total trade and other receivables	24.0	25.6
Allowance for doubtful accounts: Long-term
Trade accounts receivable	0.0	0.0
Trade notes receivable	0.0	0.0
Total trade receivables	0.0	0.0
Other notes receivable	(15.0)	(15.0)
Total allowance for doubtful accounts	(15.0)	(15.0)
Total net receivables, Long-term	9.0	10.6
Trade accounts receivable	571.8	548.8
Allowance for credit losses	16.0
Residential Products
Current
Trade accounts receivable	26.0	26.7
Allowance for doubtful accounts: Long-term
Trade accounts receivable	$ 26.0	26.7
Allowance for credit losses		15.9
Residential Products | Notes Receivable
Allowance for doubtful accounts: Long-term
Allowance for credit losses		15.0
Residential Products | Trade Accounts Receivable
Allowance for doubtful accounts: Long-term
Allowance for credit losses		$ 0.9