Subsequent Events (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2018
Subsequent Event [Line Items]
Capital expenditures		$ 130.8	$ 170.2	$ 131.6
Share repurchase program, number of shares authorized			800,000		800,000
Minimum [Member]
Subsequent Event [Line Items]
Restructuring and related costs, expected cost	$ 8.0
Capital expenditures	9.0
Effect on future earnings, amount	17.0
Maximum [Member]
Subsequent Event [Line Items]
Restructuring and related costs, expected cost	13.0
Capital expenditures	14.0
Effect on future earnings, amount	$ 22.0