CF INDUSTRIES HOLDINGS, INC., AS GUARANTOR AND CF INDUSTRIES, INC., AS ISSUER $250,000,000 4.49% GUARANTEED SENIOR NOTES, SERIES A, DUE OCTOBER 15, 2022 $500,000,000 4.93% GUARANTEED SENIOR NOTES, SERIES B, DUE OCTOBER 15, 2025 $250,000,000 5.03%...