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Leases (Tables)
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Lease Expense, Term and Discount Rate
The components of lease expense are as follows:
Three Months Ended June 30,Six Months Ended June 30,
In millions2020201920202019
Operating lease expense$14.1  $13.4  $28.8  $26.8  
Finance lease expense amortization of leased assets0.3  0.3  0.6  0.5  
Short-term and variable lease expense—  0.2  0.1  0.3  
Sublease income(0.1) (0.1) (0.2) (0.3) 
Total$14.3  $13.7  $29.3  $27.3  
The following table summarizes the remaining lease term and discount rate assumptions used to develop the present value of lease liabilities:
June 30, 2020
Weighted-average remaining lease term (years)
     Operating leases7.5
     Finance leases4.5
Weighted-average discount rate
     Operating leases3.0 %
     Finance leases1.5 %
Maturity of Operating Lease Liabilities
Scheduled payments of lease liabilities are as follows:
In millionsOperating LeasesFinance
Leases		Total
Remaining 2020$27.7  $0.3  $28.0  
202148.9  0.3  49.2  
202241.7  0.2  41.9  
202335.5  0.2  35.7  
202431.0  0.1  31.1  
Thereafter93.1  0.2  93.3  
Total lease payments277.9  1.3  279.2  
Less: Present value discount(26.3) —  (26.3) 
Present value lease liabilities$251.6  $1.3  $252.9  
Maturity of Finance Lease Liabilities
Scheduled payments of lease liabilities are as follows:
In millionsOperating LeasesFinance
Leases		Total
Remaining 2020$27.7  $0.3  $28.0  
202148.9  0.3  49.2  
202241.7  0.2  41.9  
202335.5  0.2  35.7  
202431.0  0.1  31.1  
Thereafter93.1  0.2  93.3  
Total lease payments277.9  1.3  279.2  
Less: Present value discount(26.3) —  (26.3) 
Present value lease liabilities$251.6  $1.3  $252.9