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13. Leases (Tables)
 9 Months Ended
Sep. 30, 2021
13. Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease expense were as follows (in millions):
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Operating lease cost$13.7 $13.4 $40.2 $38.4 
Finance lease cost:
  Amortization of right-of-use assets$0.1 $0.1 $0.4 $0.4 
  Interest on lease liabilities0.2 0.2 0.6 0.6 
        Total finance lease cost$0.3 $0.3 $1.0 $1.0 
Sublease income$0.7 $0.7 $2.2 $2.2 
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 EndedNine Months Ended
September 30,September 30,
2021202020212020
Cash paid for amounts included in the measurement of lease liabilities:
  Operating cash flows from operating leases$7.2 $10.8 $30.9 $33.0 
  Operating cash flows from finance leases$0.1 $0.1 $0.4 $0.4 
  Financing cash flows from finance leases$0.2 $0.2 $0.6 $0.6 
Right-of-use assets obtained in exchange for new lease obligations:
  Operating leases$5.8 $0.8 $12.3 $8.4 
  Finance leases$— $0.1 $— $0.2 
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
2021 (excluding the nine months ended September 30, 2021)$11.4 $0.4 
202243.0 1.3 
202337.5 1.2 
202430.9 1.1 
202527.7 1.1 
Thereafter101.5 14.0 
   Total lease payments252.0 19.1 
Less imputed interest(39.1)(8.0)
    Total$212.9 $11.1 
Lessee Supplemental Balance Sheet Information [Table Text Block] Supplemental balance sheet information related to leases was as follows (in millions):
September 30, 2021December 31, 2020
Operating Leases
  Operating lease right-of-use assets$204.2 $202.1 
  Current operating lease liabilities$36.1 $36.5 
  Operating lease liabilities176.8 175.1 
     Total operating lease liabilities$212.9 $211.6 

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):
September 30, 2021December 31, 2020
Finance Leases
  Property, plant and equipment, gross$12.2 $12.2 
  Less: accumulated depreciation and amortization(5.4)(5.0)
      Property, plant and equipment, net$6.8 $7.2 
  Current maturities of long-term debt and notes payable$0.5 $0.5 
  Long-term debt, net of current maturities10.6 11.0 
      Total finance lease liabilities$11.1 $11.5 

September 30, 2021December 31, 2020
Weighted Average Remaining Lease Term
  Operating leases - in years88
  Finance leases - in years1616
Weighted Average Discount Rate
  Operating leases3.8 %3.9 %
  Finance leases6.2 %6.2 %