Pension and Other Benefits Expected Benefit Payments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Plan 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, expected future benefit payment, next twelve months		$ 8.5
Defined benefit plan, expected future benefit payment, year two	$ 7.9
Defined benefit plan, expected future benefit payment, year three	7.9
Defined benefit plan, expected future benefit payment, year four	7.1
Defined benefit plan, expected future benefit payment, year five	7.0
Defined benefit plan, expected future benefit payment, five fiscal years thereafter	33.0
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, expected future benefit payment, next twelve months	0.0
Defined benefit plan, expected future benefit payment, year two	0.0
Defined benefit plan, expected future benefit payment, year three	0.0
Defined benefit plan, expected future benefit payment, year four	0.0
Defined benefit plan, expected future benefit payment, year five	0.0
Defined benefit plan, expected future benefit payment, five fiscal years thereafter	$ 0.1