Postretirement and Other Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of accumulated other comprehensive loss related to benefit plans	$ 3.3		$ 3.3
U.S. | Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.0	$ 0.0	0.0	$ 0.0
Interest cost	0.9	1.2	2.8	3.5
Expected return on plan assets	(1.2)	(1.5)	(3.7)	(4.4)
Amortizations and other	0.9	0.5	2.5	1.5
Net periodic benefit cost	0.6	0.2	1.6	0.6
French
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of accumulated other comprehensive loss related to benefit plans	0.9		0.9
French | Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.3	0.3	0.9	0.8
Interest cost	0.0	0.1	0.1	0.3
Expected return on plan assets	0.0	(0.1)	0.0	(0.1)
Amortizations and other	0.3	0.2	0.7	0.6
Net periodic benefit cost	$ 0.6	$ 0.5	$ 1.7	$ 1.6