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Other Assets Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2022
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Intangible assets are summarized as follows:
March 31,
2022		December 31,
2021
Intangible assets  
Favorable leasehold interests$2.8 $2.8 
Developed technology asset92.0 92.0 
Customer relationships intangible asset137.2 137.2 
Total intangible assets$232.0 $232.0 
Less: Accumulated amortization - favorable leasehold interest(1.9)(1.9)
         Accumulated amortization - developed technology asset(10.4)(8.8)
         Accumulated amortization - customer relationships(11.1)(9.0)
Intangible assets, net$208.6 $212.3 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The amortization for each of the five succeeding years relating to intangible assets currently recorded in the Condensed Consolidated Balance Sheet and the weighted average amortization is estimated to be the following as of March 31, 2022:
YearFavorable leasehold interestDeveloped TechnologyCustomer RelationshipsTotal
remaining in 2022$0.1 $4.5 $6.0 $10.6 
20230.1 6.1 8.1 14.3 
20240.1 6.1 8.1 14.3 
20250.1 6.1 8.1 14.3 
20260.1 6.1 8.1 14.3 
20270.1 6.1 8.1 14.3 
Weighted average amortization period7.3 years13.3 years16.2 years15.0 years