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Equity (Tables)
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of Stock by Class
Details of the Company's "at-the-market" offering activity was as follows:
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
(In millions)
Shares issued1.0 — 2.8 — 
Net proceeds *$34.2 $— $88.8 $— 
Issuance costs$.5 $— $1.2 $— 
*    Net proceeds were used for capital expenditures.