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Supplemental Cash Flow Information
6 Months Ended
Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information SUPPLEMENTAL CASH FLOW INFORMATION
Six months ended
June 30,
(in millions)20212020
Cash paid during the period for income taxes$1.7 $1.0 
Cash paid for interest1.7 4.3 
Cash received for income tax receivables89.9 — 
Fair value adjustment on marketable investment securities recorded to stockholders' equity(0.3)0.7
Establishment of operating lease right-of-use assets and lease liabilities
Operating lease right-of-use assets$40.5 $— 
Operating lease liabilities46.7 —