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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments and Rental Commitments The aggregate future minimum lease payments for capital leases, operating leases, and rental commitments as of December 31, 2018 are as follows:
(in millions)
Capital Leases
 
Operating Leases
2019
$
2.3

 
$
9.7

2020
2.3

 
9.3

2021
2.3

 
8.8

2022
2.3

 
8.1

2023
2.3

 
6.1

2024 and thereafter
2.6

 
3.8

Total minimum lease payments
14.1

 
45.8

Less sublease rental income
—

 
(8.8
)
Net minimum lease payments
14.1

 
$
37.0

Less imputed interest
(1.6
)
 
 
Present value of capital lease obligations
$
12.5