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Leases (Tables)
12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
The table below reconciles undiscounted payments for operating leases with terms greater than 12 months to the operating lease liabilities recorded on the balance sheet (in millions).
2021$3.2 
20221.8 
20231.0 
20241.0 
20251.0 
Thereafter1.8 
Total lease payments9.8 
Less imputed interest3.1 
Present value of lease payments$6.7