Inclusion of Equity Values [Member] Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Peter Altabef [Member] Thomson [Member] Change in Fair Value
from Last Day of Prior
Year to Last Day of Year of Unvested Equity
Awards [Member] Exclusion of Stock Awards [Member] Altabef [Member] Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Michael M. Thomson [Member] Fair Value at Last Day
of Prior Year of
Equity Awards
Forfeited During
Year [Member] Average Vesting- Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs [Member] Change in Fair Value
from Last Day of
Prior Year to Vesting
Date of Unvested
Equity Awards
that Vested During
Year [Member] Total-Inclusion of
Equity Values [Member] Year-End Fair Value
of Equity Awards
Granted During
Year That Remained
Unvested as of Last
Day of Year [Member]