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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plan and Restoration of Retirement Income Plan:      
Amortization of deferred net loss $ 1.7 $ 2.2 $ 1.2
Net gain (loss) arising during the period (0.6) (5.8) (7.0)
Settlement cost 3.2 2.9 (0.1)
Postretirement plans:      
Amortization of deferred net loss 0.0 0.8 0.5
Net gain (loss) arising during the period 0.1 5.6 (1.9)
Amortization of prior service cost (1.0) (1.1) (1.1)
Amortization of deferred interest rate swap hedging losses $ 0.0 $ 0.0 $ 0.1