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Fair Value Of Assets And Liabilities (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
 
Level 1
(in millions)
June 30, 2018
 
December 31, 2017
Cash equivalents and restricted cash
$
40.1

 
$
31.2