Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE LOSS (Parenthetical)

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Unrecognized actuarial losses and prior service cost related to pension and other postretirement benefit plans, accumulated tax $ 150.6 $ 138.2 $ 150.1
Cash flow hedging transactions, tax $ 0.9 $ 1.0 $ 1.1