Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:	$ (637.6)	$ (631.5)
Other comprehensive income (loss)	(1.4)	(70.7)
Stockholders' Equity Note, Spinoff Transaction	(6.7)	(49.9)
Balance at June 30:	(639.0)	(699.8)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:	(346.8)	(225.8)
Other comprehensive income (loss)	(17.1)	(80.1)
Balance at June 30:	(363.9)	(305.9)
Accumulated  other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	(1.4)	(68.3)
Stockholders' Equity Note, Spinoff Transaction	0.0	0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:	7.1	10.8
Other comprehensive income (loss)	8.8	(3.4)
Balance at June 30:	15.9	7.4
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:	(297.9)	(416.5)
Other comprehensive income (loss)	6.9	15.2
Balance at June 30:	(291.0)	(401.3)
Noncontrolling Interests
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	0.0	(2.4)
Stockholders' Equity Note, Spinoff Transaction	$ 0.0	0.0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Noncontrolling Interest		$ (2.4)