Benefit Plans Benefit Plans - Change in Plan Assets Unobservable Inputs (Details) - Pension Benefits - Level 3 - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Balance, January 1	$ 47.2	$ 47.4
Dispositions	(2.8)	(4.3)
Realized and unrealized gain (loss), net	3.6	4.1
Balance, December 31	48.0	47.2
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Balance, January 1	81.8	230.6
Dispositions	4.9	(175.3)
Realized and unrealized gain (loss), net	(14.9)	26.5
Balance, December 31	$ 71.8	$ 81.8

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