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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income $ 55.0 $ 10.3
Other comprehensive income (loss)    
Foreign currency translation adjustments 2.8 6.1
Unrealized loss on investments, net of tax 0.3 0.0
Defined benefit pension plans:    
Change benefit obligations, translation adjustment (0.2) (0.8)
Amortization of amounts included in net periodic benefit cost, net of tax 1.1 0.9
Other comprehensive income 4.0 6.2
Comprehensive income 59.0 16.5
Actuarial loss, net of tax    
Defined benefit pension plans:    
Amortization of amounts included in net periodic benefit cost, net of tax 0.9 0.8
Other comprehensive income 0.7 0.0
Prior service cost, net of tax    
Defined benefit pension plans:    
Amortization of amounts included in net periodic benefit cost, net of tax 0.2 0.1
Other comprehensive income $ 0.2 $ 0.1