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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net income $ 70.7 $ 36.8
Other comprehensive income (loss), net of tax:    
Currency translation 10.7 9.0
Marketable securities   (0.2)
Interest rate swap   0.6
Total other comprehensive income, net 13.0 12.4
Comprehensive income 83.7 49.2
Defined Benefit Pension Plans    
Other comprehensive income (loss), net of tax:    
Defined benefit plans 2.4 3.1
OPEB    
Other comprehensive income (loss), net of tax:    
Defined benefit plans $ (0.1) $ (0.1)