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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of Asset Impairment Expense
The following is a summary of asset impairment expense.
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions)2021202020212020
Operating lease right-of-use assets$— $3.3 $10.5 $75.6 
Property, plant and equipment and leasehold intangibles, net
0.6 4.9 2.9 19.6 
Investment in unconsolidated ventures— — — 1.5 
Asset impairment$0.6 $8.2 $13.4 $96.7