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Intangible Assets and Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
   December 31,
2020		   December 31,
2019		 
   (in millions) 
Trademarks  $22.4   $21.6 
Customer relationships   20.7    20.1 
    43.1    41.7 
Less: accumulated amortization   (35.4)   (31.8)
   $7.7   $9.9 
Schedule of estimated intangible asset amortization expense
Year ending December 31, (in millions)    
2021  $0.9 
2022   0.9 
2023   0.9 
2024   0.9 
2025   0.9 
Thereafter   3.2 
Total  $7.7 
Schedule of goodwill
   December 31,
2020		   December 31,
2019		 
   (in millions) 
Balance at beginning of period  $80.9   $44.9 
Foreign currency translation adjustments   2.6    3.9 
Acquisition of NTG   0.2    32.1 
Ending balance  $83.7   $80.9