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Defined Benefit Plan - Defined Benefit Plan (Details) - Defined Benefit Plans - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Components of net periodic benefit cost    
Service cost $ 0.7 $ 0.8
Interest cost 1.5 1.4
Expected return on plan assets (2.4) (2.6)
Amortization of unrecognized loss 0.9 1.1
Net periodic benefit cost 0.7 0.7
Amortization of unrecognized loss, tax $ (0.2) $ (0.3)