Accumulated Other Comprehensive Income (Parentheticals) (Details)
$ in Millions
|6 Months Ended|
Jun. 30, 2018
|Statement Of Income And Comprehensive Income [Abstract]|
|Amount expected to be reclassified into earnings||$ 49.3|
The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.
Reference 1: http://www.xbrl.org/2003/role/disclosureRef