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Employee Benefit Plans (Reconciliation of Level 3 Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Fair value of plan assets		$ 711.0
Pension Benefits
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Foreign currency exchange rate changes	$ 32.2	16.5
Fair value of plan assets	808.6	711.0	$ 617.1
Pension Benefits | Alternative Investments
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Fair value of plan assets	40.6	35.6
Pension Benefits | Miscellaneous Funds
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Fair value of plan assets	36.6	30.8
Level 3
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Fair value of plan assets		33.1
Level 3 | Pension Benefits
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Related to assets still held at reporting	0.1	1.9
Relating to assets sold during period	0.0	0.0
Purchases, sales and /or settlements	2.4	1.3
Foreign currency exchange rate changes	3.1	(0.6)
Fair value of plan assets	38.7	33.1	30.5
Level 3 | Pension Benefits | Alternative Investments
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Related to assets still held at reporting	(0.2)	(0.1)
Relating to assets sold during period	0.0	0.0
Purchases, sales and /or settlements	0.0	0.1
Foreign currency exchange rate changes	0.0	0.0
Fair value of plan assets	2.1	2.3	2.3
Level 3 | Pension Benefits | Miscellaneous Funds
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]
Related to assets still held at reporting	0.3	2.0
Relating to assets sold during period	0.0	0.0
Purchases, sales and /or settlements	2.4	1.2
Foreign currency exchange rate changes	3.1	(0.6)
Fair value of plan assets	$ 36.6	$ 30.8	$ 28.2

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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-Publisher FASB
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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

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