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Contract Liabilities and Remaining Performance Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction The following table represents the total transaction price for the remaining performance obligations as of December 31, 2018 related to non-cancelable contracts longer than 12 months in duration that is expected to be recognized over future periods.
(in millions)
 
Within 1 Year
 
Years 1-2
 
Years 2-3
 
Thereafter
Remaining performance obligations
 
$
37.8

 
$
23.7

 
$
5.4

 
$
0.4