Pensions and Postretirement Benefits Other Than Pensions (Schedule of Pretax Amounts Recognized in Accumulated Other Comprehensive Income or (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current year changes recorded to Accumulated other comprehensive income (loss)	$ 16.8	$ 54.2	$ 111.4
Amortization reclassified to earnings	(7.4)	(21.6)	(38.6)
Stockholders' Equity Note, Spinoff Transaction		(18.9)	(49.0)
Pension Plans [Member]
Balance at December 31, 2013	(530.7)
Current year changes recorded to Accumulated other comprehensive income (loss)	9.4
Amortization reclassified to earnings	19.8
Settlements/curtailments reclassified to earnings	1.4	15.0	$ 8.0
Currency translation and other	(3.7)
Balance at December 31, 2014	(503.8)	(530.7)
Pension Plans [Member] | Net Actuarial Losses [Member]
Balance at December 31, 2013	(509.8)
Current year changes recorded to Accumulated other comprehensive income (loss)	9.4
Amortization reclassified to earnings	16.2
Settlements/curtailments reclassified to earnings	(1.4)
Currency translation and other	(3.0)
Balance at December 31, 2014	(485.8)	(509.8)
Pension Plans [Member] | Prior Service Cost [Member]
Balance at December 31, 2013	(20.9)
Current year changes recorded to Accumulated other comprehensive income (loss)	0.0
Amortization reclassified to earnings	3.6
Settlements/curtailments reclassified to earnings	0.0
Currency translation and other	(0.7)
Balance at December 31, 2014	$ (18.0)	$ (20.9)