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
Sep. 30, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]    
Unrecognized actuarial losses and prior service cost related to pension and other postretirement benefit plans, accumulated tax $ 146.4 $ 150.6
Cash flow hedging transactions, accumulated tax $ 0.8 $ 0.9