Employee Benefit Plans - Reconciliation of the Fair Values Measurements of Plan Assets Using Significant Unobservable Inputs (Level 3) from the Beginning of the Year to the End of the Year (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of fair value measurements of plan assets using significant observable inputs
Fair value of plan assets, beginning of year	$ 125.0
Fair value of plan assets, end of year	144.8	$ 125.0
Insurance Group Annuity Contracts
Reconciliation of fair value measurements of plan assets using significant observable inputs
Fair value of plan assets, beginning of year	$ 12.0	$ 14.4
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	us-gaap:FairValueInputsLevel3Member	us-gaap:FairValueInputsLevel3Member
Actual return on assets	$ 1.1	$ (0.3)
Benefit payments	(1.0)	(1.3)
Foreign currency impact	0.5	(0.8)
Fair value of plan assets, end of year	$ 12.6	$ 12.0
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	us-gaap:FairValueInputsLevel3Member	us-gaap:FairValueInputsLevel3Member