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Research And Development
 12 Months Ended
Dec. 31, 2020
Research and Development [Abstract]  
Research And Development Research and Development
Research and development costs are expensed when incurred.
(in millions) December 31,202020192018
Research and Development Costs$74.6 $74.7 
(a)
$89.1 
(a)
(a)
The Company revised the fiscal year 2019 and 2018 amounts reported above to increase certain research and development costs that were excluded from the previously reported amounts by $27.2 million and $30.7 million, respectfully. This correction had no effect on the Company’s previously reported consolidated financial statements as of and for the years ended December 31, 2019 and 2018.