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Operating Leases - Schedule of Operating Leases Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease liabilities	$ (17.3)	$ (18.0)	$ 0.0
Asset obtained in exchange for operating lease liability	5.0	37.3
Reduction of right-of use assets resulting from reductions to lease obligations	$ 13.0	$ 6.1
Operating lease, weighted average remaining lease term (years(	9 years 1 month 6 days	10 years 1 month 6 days
Operating lease, weighted average discount rate (percent)	5.00%	5.00%

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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-Publisher FASB
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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