Income Taxes (Deferred Tax Assets (Liabilities) Classification) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Deferred tax asset	$ 135.8	$ 161.2
Deferred tax liabilities:
Long-term income taxes	(2.0)	(8.1)
Net deferred tax assets	133.8	153.1
Other Assets
Deferred tax assets:
Deferred tax asset	135.8	161.2
Long Term Income Taxes
Deferred tax liabilities:
Long-term income taxes	$ (2.0)	$ (8.1)

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e31931-109318

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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