Debt - Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 22, 2020	Dec. 31, 2019	Jul. 05, 2019	Jul. 02, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 1,173.0		$ 778.4
Secured Debt | Term Loan due July 5, 2023
Debt Instrument [Line Items]
Long-term Debt	49.9		49.9	$ 49.9
Senior Notes
Debt Instrument [Line Items]
Long-term Debt			448.6
Senior Notes | 5.000% Senior Notes due September 19, 2022
Debt Instrument [Line Items]
Long-term Debt	278.7		279.9
Stated interest rate					5.00%
Senior Notes | 4.350% Senior Notes due February 15, 2025
Debt Instrument [Line Items]
Long-term Debt	$ 448.8
Stated interest rate	4.35%
Senior Notes | 2.400% Senior Notes due September 30, 2030
Debt Instrument [Line Items]
Long-term Debt	$ 395.6		$ 0.0
Stated interest rate		2.40%