This is what I found on Suh's contract:
From a contractual standpoint, Suh is signed through 2014 (the 2015 year in his rookie contract will void five days after the 2014 Super Bowl) and is currently due $22.7 million in base salary over the next two seasons. Suh is scheduled to earn $11.15 million in 2013, of which $2.7 million is fully guaranteed, and $11.55 million in non-guaranteed base salary in 2014. Additionally, Suh has $4 million available in base salary escalators and incentives. Any team that acquires Suh will need to have $11.275 million in cap space in 2013 just to fit him on its active roster before reducing that figure with what is likely to be a very lucrative multi-year extension.
On the day before the 2012 league year began on March 13, Suh bailed out the salary cap-strapped Lions by agreeing to renegotiate his contract. Suh's $10.25 million base salary was reduced to $540,000, the league minimum for a player with two accrued seasons, and the remaining $9.71 million was converted to a signing bonus that was prorated over four seasons. The restructured deal lowered Suh's 2012 cap number by nearly $3.5 million, but added $2.4275 million to his 2013, 2014 and 2015 cap numbers.
Most of the top DT's make about 9 mil a year which is about what Suh would be making before he restructured, it then went up to over 11 mil a year.