Employee Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Retirement Benefits, Description [Abstract]
Number of participants domestic pension plan	3,300
Number of participants postretirement benefit plan	1,600
Deferred Compensation Arrangements [Abstract]
Deferred compensation and benefit liability balance	$ 196.2	$ 213.2
Deferred compensation and benefit arrangement expense	10.0	18.5	$ 18.5
Cash Surrender Value of Life Insurance	177.3	177.4
Long-Term Disability Plan [Abstract]
Long-term disability plan obligation	5.9	$ 8.4
Long term disability plan, income replacement benefit obligation	$ 0.0