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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2018
Long-term debt [Abstract]  
Long-term indebtedness
The components of long-term indebtedness are as follows:

  
December 31,
 
(in millions) 
 
2018
  
2017
 
Senior secured credit agreement - Term loan due 2023
 
$
447.2
  
$
-
 
Senior secured credit agreement - Revolver loan due 2023
  
348.0
   
-
 
2.875% Convertible Senior Notes due 2021
  
10.6
   
10.6
 
Other
  
3.0
   
3.0
 
Total long-term indebtedness 
 
$
808.8
  
$
13.6
 
Current portion of long-term indebtedness, net of debt issuance costs
  
(10.1
)
  
-
 
Unamortized debt issuance costs
  
(14.2
)
  
(0.1
)
Noncurrent portion of long-term indebtedness 
 
$
784.5
  
$
13.5
 

Future debt payments of long term indebtedness
Future debt payments of long-term indebtedness are as follows:

(in millions)
 
December 31, 2018
 
2019
 
$
11.3
 
2020
  
14.1
 
2021
  
35.9
 
2022
  
33.8
 
2023 and thereafter
  
713.7
 
Total long-term indebtedness 
 
$
808.8