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Leasing (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Components of lease cost [Table Text Block] Lease cost consists of the following:
 Twelve Months Ended
 December 31,
 202120202019
 (in millions)
Finance lease cost
     Amortization of right-of-use assets$4.2 $1.8 $1.0 
Interest on lease liabilities2.0 0.4 0.3 
Total finance lease cost6.2 2.2 1.3 
Operating lease cost33.3 32.7 28.9 
Short-term lease cost1.6 3.0 5.9 
Variable lease cost3.2 2.9 7.2 
Total lease cost$44.3 $40.8 $43.3 
Supplemental lease information [Table Text Block] The following table summarizes additional information related to our lease agreements.
 Twelve Months Ended
 December 31,
 202120202019
 (in millions, except lease term and rate)
Cash paid for amounts included in measurement of lease liabilities
Operating cash flows from finance leases$2.0$0.3$0.3
Operating cash flows from operating leases35.935.129.0
Financing cash flows from finance leases5.03.01.0
Weighted-average remaining lease term - finance leases16.4 years15.8 years2.8 years
Weighted-average remaining lease term - operating leases8.6 years8.7 years9.2 years
Weighted-average discount rate - finance leases4.8 %4.2 %5.1 %
Weighted-average discount rate - operating leases5.2 %5.7 %6.1 %
Future minimum lease payments [Table Text Block] Future undiscounted minimum payments under non-cancelable leases are as follows:
Finance LeasesOperating Leases
(in millions)
2022$10.4 $30.4 
20238.3 23.8 
20247.4 17.4 
20257.3 13.9 
20267.3 10.7 
Thereafter85.5 60.2 
Total future undiscounted minimum lease payments126.2 156.4 
Less: Impact of discounting(37.4)(31.9)
Total$88.8 $124.5 
Right of use assets and lease liabilities [Table Text Block] The right-of-use assets and lease liabilities recorded on our Consolidated Balance Sheets are as follows:
December 31, 2021December 31, 2020
Finance LeasesOperating LeasesFinance LeasesOperating Leases
(in millions)(in millions)
Property, plant and equipment, net$113.4 $— $24.9 $— 
Operating lease right-of-use assets— 123.7 — 116.6 
Total$113.4 $123.7 $24.9 $116.6 
Current portion of operating lease liabilities$— $24.6 $— $22.6 
Accrued expenses and other6.3 — 3.3 — 
Long-term portion of operating lease liabilities— 99.9 — 94.4 
Postretirement benefits and other long-term liabilities82.5 — 18.3 — 
Total$88.8 $124.5 $21.6 $117.0