Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Loss - Statement (Parenthetical)

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Accumulated Other Comprehensive Loss - Statement (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Statement of Other Comprehensive Income [Abstract]    
Unrecognized actuarial losses and prior service cost related to pension and other postretirement benefit plans, accumulated tax $ 92.8 $ 95.6
Cash flow hedging transactions, accumulated tax $ 0.7 $ 0.7