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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net income $ 338.2 $ 271.3 $ 395.8
Pension Plan and Restoration of Retirement Income Plan:      
Amortization of deferred net loss, net of tax of $1.7, $2.2 and $1.2, respectively 2.8 2.5 1.8
Net loss arising during the period, net of tax of ($0.6), ($5.8) and ($7.0), respectively (0.7) (9.5) (11.1)
Settlement cost, net of tax of $3.2, $2.9 and ($0.1), respectively 5.0 4.6 (0.1)
Postretirement Benefit Plans:      
Amortization of deferred net loss, net of tax of $0, $0.8 and $0.5, respectively 0.0 1.2 0.9
Net gain (loss) arising during the period, net of tax of $0.1, $5.6 and ($1.9), respectively 0.2 9.3 (3.1)
Amortization of prior service cost, net of tax of ($1.0), ($1.1) and ($1.1), respectively (1.5) (1.8) (1.8)
Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0 and $0.1, respectively 0.0 0.0 0.2
Other comprehensive income (loss), net of tax 5.8 6.3 (13.2)
Comprehensive income $ 344.0 $ 277.6 $ 382.6