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13. Leases (Tables)
 6 Months Ended
Jun. 30, 2022
13. Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease expense were as follows (in millions):
Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
Operating lease cost$14.7 $11.8 $29.0 $23.5 
Finance lease cost:
  Amortization of right-of-use assets$0.1 $0.1 $0.2 $0.3 
  Interest on lease liabilities0.2 0.2 0.4 0.4 
        Total finance lease cost$0.3 $0.3 $0.6 $0.7 
Sublease income$0.7 $0.7 $1.5 $1.5 
The sublease is for a building with a term that ends in 2025, with no options to extend or renew.
Lessee Supplemental Cash Flow Information [Table Text Block]
Supplemental cash flow information related to leases was as follows (in millions):
Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
Cash paid for amounts included in the measurement of lease liabilities:
  Operating cash flows from operating leases$9.1 $11.9 $18.6 $23.7 
  Operating cash flows from finance leases$0.2 $0.1 $0.4 $0.3 
  Financing cash flows from finance leases$0.1 $0.2 $0.2 $0.4 
Right-of-use assets obtained in exchange for new lease obligations:
  Operating leases$1.6 $2.3 $7.1 $6.5 
  Finance leases$— $— $— $— 
Maturities Of Lease Liabilities For Operating and Finance Leases [Table Text Block]
Maturities of lease liabilities were as follows (in millions):
Year Ending December 31,Operating LeasesFinance Leases
2022 (excluding the six months ended June 30, 2022)$20.7 $1.2 
202339.2 1.2 
202433.0 1.1 
202529.5 1.1 
202623.8 1.1 
Thereafter74.5 12.4 
   Total lease payments220.7 18.1 
Less imputed interest(26.5)(7.4)
    Total$194.2 $10.7 
Lessee Supplemental Balance Sheet Information [Table Text Block]
Supplemental balance sheet information related to leases was as follows (in millions):
June 30, 2022December 31, 2021
Operating Leases
  Operating lease right-of-use assets$185.2 $204.8 
  Current operating lease liabilities$35.7 $36.4 
  Operating lease liabilities158.5 175.9 
     Total operating lease liabilities$194.2 $212.3 

Finance leases are included in Property, plant and equipment, Current maturities of long-term debt, and Long-term debt, net of current maturities (in millions):
June 30, 2022December 31, 2021
Finance Leases
  Property, plant and equipment, gross$11.7 $11.8 
  Less: accumulated depreciation and amortization(5.2)(5.1)
      Property, plant and equipment, net$6.5 $6.7 
  Current maturities of long-term debt and notes payable$0.5 $0.5 
  Long-term debt, net of current maturities10.2 10.5 
      Total finance lease liabilities$10.7 $11.0 

June 30, 2022December 31, 2021
Weighted Average Remaining Lease Term
  Operating leases - in years78
  Finance leases - in years1515.5
Weighted Average Discount Rate
  Operating leases3.2 %3.3 %
  Finance leases6.3 %6.3 %