Income Taxes (Income Tax Uncertainties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Document Period End Date	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 11.6	$ 17.8
Additions for tax positions of prior years	0.5	0.9
Reductions for tax positions of prior years	(0.3)	(6.1)
Lapses of applicable statutes of limitations	(0.1)	(1.0)
Balance at end of period	11.7	11.6
Unrecognized tax benefits that would impact the effective tax rate, if recognized	5.2
Interest income	(0.5)	(0.3)
Refunds	(0.1)	0.0
Accrued interest related to income tax uncertainties	0.2	0.6
Accrued penalties related to income tax uncertainties	0.0	0.1
Resolution of Audits or Statute Expirations
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Reasonably possible decrease in unrecognized tax benefits	0.5
Other Current Liabilities
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Accrued interest related to income tax uncertainties	0.0	0.5
Accrued penalties related to income tax uncertainties	0.0	0.1
Other Noncurrent Liabilities
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Accrued interest related to income tax uncertainties	0.2	0.1
Accrued penalties related to income tax uncertainties	$ 0.0	$ 0.0