Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 0.3	$ 0.3	$ 0.6	$ 0.7
Interest cost	1.9	2.5	4.0	5.0
Expected return on assets	(3.0)	(2.9)	(6.0)	(5.8)
Amortization of prior service credit	(0.1)	(0.1)	(0.3)	(0.3)
Recognized actuarial losses (gains)	0.1	0.0	0.2	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0.9	0.0	2.3	0.0
Net periodic benefit cost	0.1	(0.2)	0.8	(0.4)
U.S. plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	(0.3)	(0.7)	0.1	(1.4)
International plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.4	0.5	0.7	1.0
Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.3	0.3	0.6	0.7
Interest cost	1.9	2.5	3.9	4.9
Expected return on assets	(3.0)	(2.9)	(6.0)	(5.8)
Amortization of prior service credit	0.0	0.0	0.0	0.0
Recognized actuarial losses (gains)	0.5	0.6	1.0	1.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0.9	0.0	2.3	0.0
Net periodic benefit cost	0.6	0.5	1.8	0.9
Pension benefits | U.S. plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.2	0.0	1.1	(0.1)
Pension benefits | International plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.4	0.5	0.7	1.0
Other retirement benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.0	0.0	0.1	0.1
Expected return on assets	0.0	0.0	0.0	0.0
Amortization of prior service credit	(0.1)	(0.1)	(0.3)	(0.3)
Recognized actuarial losses (gains)	(0.4)	(0.6)	(0.8)	(1.1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0.0	0.0	0.0	0.0
Net periodic benefit cost	(0.5)	(0.7)	(1.0)	(1.3)
Other retirement benefits | U.S. plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	(0.5)	(0.7)	(1.0)	(1.3)
Other retirement benefits | International plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	$ 0.0	$ 0.0	$ 0.0	$ 0.0