Income Taxes (Schedule of Income before Income Taxes and Equity in Net Income of Unconsolidated Entities) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S.									$ 159.7	$ 188.2	$ 143.5
Non-U.S.									38.8	44.7	37.6
Income before income taxes and equity in net loss of unconsolidated entities	$ 35.7	$ 63.5	$ 53.1	$ 46.2	$ 48.4	$ 72.7	$ 55.0	$ 56.8	$ 198.5	$ 232.9	$ 181.1