XML 23 R4.htm IDEA: XBRL DOCUMENT v3.8.0.1
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Plan and Restoration of Retirement Income Plan:      
Amortization of deferred net loss, net of tax of $1.4, $1.7 and $2.2, respectively $ 1.4 $ 1.7 $ 2.2
Net gain (loss) arising during the period, net of tax of $0.2, ($0.6) and ($5.8), respectively 0.2 (0.6) (5.8)
Amortization of prior service cost, net of tax of $0.0, $0.0 and $0.0, respectively 0.0 0.0 0.0
Settlement cost, net of tax of $1.4, $3.2 and $2.9, respectively 1.4 3.2 2.9
Postretirement plans:      
Settlement cost, net of tax of $0.2, $0.0 and $0.0, respectively 0.2 0.0 0.0
Prior service cost arising during the period, net of tax of $4.0, $0.0 and $0.0, respectively 4.0 0.0 0.0
Amortization of deferred net loss, net of tax of $0.0, $0.0 and $0.8, respectively 0.0 0.0 0.8
Net (loss) gain arising during the period, net of tax of ($0.2), $0.1 and $5.6, respectively (0.2) 0.1 5.6
Amortization of prior service cost, net of tax of ($0.3), ($1.0) and ($1.1), respectively (0.3) (1.0) (1.1)
Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0 and $0.0, respectively $ 0.0 $ 0.0 $ 0.0