Equity Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:			$ (1,006.6)			$ (964.1)	$ (1,006.6)	$ (964.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax							79.0	(134.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax							33.8	36.6
Stockholders' Equity Note, Spinoff Transaction	$ (5.9)	$ (17.2)	(1,334.3)
Provision for income taxes							(6.5)	(8.3)
Other comprehensive income (loss)	115.0	52.0	(58.6)	$ (131.1)	$ 20.6	5.9	108.4	(104.6)
Balance at June 30:	(761.0)			(1,069.8)			(761.0)	(1,069.8)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:			(554.8)			(516.8)	(554.8)	(516.8)
Other Comprehensive Income (Loss), before Reclassifications, before Tax							105.3	(140.4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax							0.0	0.0
Stockholders' Equity Note, Spinoff Transaction							70.2
Provision for income taxes							0.0	0.0
Other comprehensive income (loss)							175.5	(140.4)
Balance at June 30:	(379.3)			(657.2)			(379.3)	(657.2)
Accumulated  other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Note, Spinoff Transaction			139.3				139.3
Other comprehensive income (loss)	115.1	$ 49.9	(58.7)	(130.6)	$ 19.4	5.5		(105.7)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:			5.6			6.7	5.6	6.7
Other Comprehensive Income (Loss), before Reclassifications, before Tax							1.7	(0.7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax							1.1	0.8
Stockholders' Equity Note, Spinoff Transaction							0.0
Provision for income taxes							0.4	0.1
Other comprehensive income (loss)							3.2	0.2
Balance at June 30:	8.8			6.9			8.8	6.9
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31:			$ (457.4)			$ (454.0)	(457.4)	(454.0)
Other Comprehensive Income (Loss), before Reclassifications, before Tax							(28.0)	7.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax							32.7	35.8
Stockholders' Equity Note, Spinoff Transaction							69.1
Provision for income taxes							(6.9)	(8.4)
Other comprehensive income (loss)							66.9	34.5
Balance at June 30:	$ (390.5)			$ (419.5)			(390.5)	$ (419.5)
IndustrialSegmentBusinesses [Domain] | Accumulated  other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)							$ 245.6