XML 22 R3.htm IDEA: XBRL DOCUMENT v3.8.0.1
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income $ 619.0 $ 338.2 $ 271.3
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 2.5 2.8 2.5
Amortization of prior service cost, net of tax of $0.0, $0.0 and $0.0, respectively (0.1) 0.0 0.0
Net gain (loss) arising during the period, net of tax of $0.2, ($0.6) and ($5.8), respectively 0.4 (0.7) (9.5)
Settlement cost, net of tax of $1.4, $3.2 and $2.9, respectively 2.2 5.0 4.6
Postretirement Benefit Plans:      
Amortization of prior service cost, net of tax of ($0.3), ($1.0) and ($1.1), respectively (0.6) (1.5) (1.8)
Amortization of deferred net loss, net of tax of $0.0, $0.0 and $0.8, respectively 0.0 0.0 1.2
Prior service cost arising during the period, net of tax of $4.0, $0.0 and $0.0, respectively 6.3 0.0 0.0
Net (loss) gain arising during the period, net of tax of ($0.2), $0.1 and $5.6, respectively (0.6) 0.2 9.3
Settlement cost, net of tax of $0.2, $0.0 and $0.0, respectively 0.5 0.0 0.0
Other comprehensive income, net of tax 10.6 5.8 6.3
Comprehensive income $ 629.6 $ 344.0 $ 277.6