Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE LOSS (Parenthetical)

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]    
Unrecognized actuarial losses and prior service cost related to pension and other postretirement benefit plans, accumulated tax $ 137.3 $ 138.2
Cash flow hedging transactions, net of accumulated tax $ 0.9 $ 1.0