Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Pension Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Periodic Pension Expense
Defined benefit retirement plans	$ (1.0)	$ (1.6)	$ 0.6
Union sponsored multi-employer pension plan	2.5	2.1	1.9
Retirement savings plans-matching contributions	11.4	10.2	9.7
Retirement savings plans-profit sharing contributions	10.4	10.2	9.2
Net periodic expense	$ 23.3	$ 20.9	$ 21.4