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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Unrealized (losses) gains on revaluation of long-term intercompany balances, tax $ 0.0 $ 0.0
Change in unrealized gain/losses on cash flow hedges, tax 0.0 0.0
Adjustments of and amortization of net actuarial loss and prior service cost, tax $ 0.2 $ 0.2