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Leases (Tables)
 9 Months Ended
Sep. 30, 2019
Leases [Abstract]  
Lease Cost The components of lease cost follow:
(in millions)Three Months Ended
September 30, 2019		Nine Months Ended
September 30, 2019
Operating lease cost
$7.1  $20.3  
Variable lease cost
0.4  3.7  
Short-term lease cost1.1  2.6  
Total lease cost$8.6  $26.6  
Summary of Lease Assets and Liabilities
A summary of lease assets and liabilities follows:
(in millions)
September 30,
2019
Assets:
Operating lease right-of-use assets(1)
$75.7  
Liabilities:
Operating lease liabilities - current(2)
20.7  
Operating lease liabilities - long-term(3)
60.8  
Total lease liabilities$81.5  
(1)Included in other long-term assets.
(2)Included in accrued liabilities and other.
(3)Included in other long-term liabilities.
Maturity of Lease Liabilities
Maturity of lease liabilities as of September 30, 2019, follow:
(in millions)
Remainder of 201920202021202220232024ThereafterTotal
Lease payments$7.0  $21.3  $16.0  $11.7  $9.1  $6.6  $22.8  $94.5  
Less: imputed interest(13.0) 
Total lease liabilities$81.5  

As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous lease accounting standard, future minimum lease payments for non-cancelable operating leases in future years would have been as follows:
(in millions)20192020202120222023Thereafter
Future minimum lease payments$16.7  $10.8  $6.8  $4.9  $4.2  $5.1  
Lease Term and Discount Rate
Lease Term and Discount Rate
September 30,
2019
Operating leases:
Weighted-average remaining lease term (in years)
6.5
Weighted-average discount rate3.9 %