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Fair Value Measurements
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Marketable Securities

As of September 30, 2021, marketable securities of $157.9 million are stated at fair value based on valuations provided by third-party pricing services and are classified within Level 2 of the valuation hierarchy.
Investment in Unconsolidated Venture

As of July 1, 2021, the Company recognized a $100.0 million asset within investment in unconsolidated ventures on its condensed consolidated balance sheet for the estimated fair value of its retained 20% noncontrolling interest in the HCS Venture. The initial recognized amount of the Company’s 20% equity interest in the HCS Venture was determined based upon a pro-rata share of the total enterprise value of the HCS Venture considering the $400.0 million purchase price paid by HCA Healthcare, as the Company's 20% interest shares ratably in all of the benefits and losses expected to be generated by the HCS Venture. The fair value measurement is classified within Level 2 of the valuation hierarchy.

Debt

The Company estimates the fair value of its debt using a discounted cash flow analysis based upon the Company's current borrowing rate for debt with similar maturities and collateral securing the indebtedness. The Company had outstanding long-term debt with a carrying amount of approximately $3.9 billion as of both September 30, 2021 and December 31, 2020. Fair value of the long-term debt approximates carrying amount in all periods presented. The Company's fair value of long-term debt disclosure is classified within Level 2 of the valuation hierarchy.

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