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Benefit Plans Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Discretionary contributions to benefit plans	$ 20.8	$ 20.1	$ 18.9
Non- controlling Interests
Defined Benefit Plan Disclosure [Line Items]
Discretionary contributions to benefit plans	$ 4.8	$ 3.9	$ 3.7

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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