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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Commitments under Non-Cancelable Operating Leases

Future commitments under non-cancelableoperating leases are as follows:

 

(in millions)

      

2019

   $ 6.5  

2020

     4.5  

2021

     3.2  

2022

     2.3  

2023

     2.1  

Thereafter

     4.4  
  

 

 

 
   $ 23.0