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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Adjustment of and amortization of net actuarial loss and prior service cost, taxes $ 0.2 $ 0.0
Other comprehensive income, equity method investment, tax $ 0.0 $ 0.0