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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]        
Cash paid during the period for income taxes     $ 1.7 $ 1.0
Cash paid for interest     1.7 4.3
Cash received for income tax receivables     89.9 0.0
Fair value adjustment on marketable investment securities recorded to stockholders' equity $ (0.1) $ 0.8 (0.3) 0.7
Establishment of operating lease right-of-use assets and lease liabilities        
Operating lease right-of-use assets     40.5 0.0
Operating lease liabilities     $ 46.7 $ 0.0