Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Amortization period for gains and losses, period 1	3 years
Amortization period for gains and losses, period 2	5 years
Postemployment benefits liability	$ 9.1	$ 9.2
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	1.53%	2.15%
Rate of return on assets	2.74%
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	$ 7.6	$ 7.6
Minimum | U.S. Pension and Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions related to continuing operations	5.0
Maximum | U.S. Pension and Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions related to continuing operations	10.0
Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	767.5	685.9	$ 617.0
Qualified pension plans, plan assets	$ 762.0	$ 695.4	$ 615.8
Weighted average discount rate	1.45%	2.05%
Rate of return on assets	2.55%	5.27%	5.20%
UK Defined Contribution Plan
Defined Benefit Plan Disclosure [Line Items]
Employer match toward contributions, doubled	5.00%
Maximum contribution percent of eligible compensation	10.00%
Employer contribution	$ 7.6	$ 7.5	$ 5.9
Personal Savings Account Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 1.0	1.3	$ 2.2
Maximum employee contribution to plan	25.00%
Maximum contribution for eligible participants	3.00%
Employer match toward contributions, fifty cents for dollar, minimum	4.00%
Employer match toward contributions, fifty cents for dollar, maximum	6.00%
Retirement Savings Account Plan
Defined Benefit Plan Disclosure [Line Items]
Employer match toward contributions, fifty cents for dollar, minimum	3.00%
Employer match toward contributions, fifty cents for dollar, maximum	6.00%
Vesting period	3 years
U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	$ 60.4	64.1
Qualified pension plans, plan assets	59.7	63.3
UK Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	545.5	482.8
Qualified pension plans, plan assets	$ 648.4	$ 582.1
Rate of return on assets	2.20%
UK Pension Plan | Liability Driven Investments
Defined Benefit Plan Disclosure [Line Items]
Liability driven investments allocation	78.00%
UK Pension Plan | Equity Securities, Emerging Market Debt and High Yield Securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities allocation	22.00%