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Equity (Tables)
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of Stock by Class
Details of the Company's "at-the-market" offering activity was as follows:
Three Months EndedSix Months Ended
June 30,June 30,
2021202020212020
(In millions)
Shares issued1.1 — 1.8 — 
Net proceeds *$34.9 $— $54.6 $— 
Issuance costs$.4 $— $.7 $— 
*    Net proceeds were used for capital expenditures.