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Cash and Cash Equivalents
 6 Months Ended
Jun. 30, 2020
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents Cash and Cash Equivalents
The following table provides a summary of cash and cash equivalents and the level in the fair value hierarchy in which those measurements fall:
June 30, 2020December 31, 2019
(in millions)TotalLevel 1Level 2TotalLevel 1
Level 2 (1)
Cash$470.3  $470.3  $—  $85.3  $85.3  $—  
Money market mutual funds305.9  305.9  —  115.5  115.5  —  
Commercial paper—  —  —  10.0  —  10.0  
Restricted cash2.9  2.9  —  2.9  2.9  —  
Total cash and cash equivalents$779.1  $779.1  $—  $213.7  $203.7  $10.0  
(1) Fair value was determined using market prices obtained from third-party pricing sources.