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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Accounts Receivable, before Allowance for Credit Loss	$ 139.0	$ 149.6
Accounts Receivable, Allowance for Credit Loss, Current	(1.6)	(1.5)
Unbilled Receivables, Current	5.1	7.4
Income Taxes Receivable, Current	16.0	0.3
Other Receivables, Net, Current	2.1	2.6
Receivables, net of allowance for current expected credit losses of $1.6 and $1.5 at December 31, 2020 and 2019	160.6	159.4
Interest Receivable, Current	0.0	1.0
Interest Costs Capitalized	0.0	5.9	$ 9.0
Sale of Accounts Receivable	256.2	159.3
Factoring Expense	1.2	1.0
Inventory, Raw Materials, Gross	17.2	19.4
Other Inventory, Gross [Abstract]	11.5	20.1
Inventory, Finished Goods, Gross	137.0	148.7
Other Inventory, Supplies, Gross	97.7	93.1
Depreciation	107.8	108.4	94.4
Asset Retirement Obligation	3.8	1.1	$ 0.4
Accretion Expense, Including Asset Retirement Obligations	0.1	0.0
Asset Retirement Obligation, Accretion Expense	0.1	0.1
Increase (Decrease) in Asset Retirement Obligations	2.5	0.6
Asset Retirement Obligation, Cash Paid to Settle	$ 0.0	$ 0.0

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