Equity (Changes In Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated other comprehensive income (loss)	$ (964.1)	$ (778.8)
Other comprehensive income (loss), net of tax	(42.5)	(185.3)	$ 511.7
Accumulated other comprehensive income (loss)	(1,006.6)	(964.1)	(778.8)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated other comprehensive income (loss)	6.7	4.7
Other comprehensive income (loss), net of tax	(1.1)	2.0
Accumulated other comprehensive income (loss)	5.6	6.7	4.7
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated other comprehensive income (loss)	(454.0)	(494.3)
Other comprehensive income (loss), net of tax	(3.4)	40.3
Accumulated other comprehensive income (loss)	(457.4)	(454.0)	(494.3)
Accumulated Other Comprehensive Income, Other [Member]
Other comprehensive income (loss), net of tax	(42.5)
Foreign Currency Gain (Loss) [Member]
Accumulated other comprehensive income (loss)	(516.8)	(289.2)
Other comprehensive income (loss), net of tax		(227.6)
Accumulated other comprehensive income (loss)	(554.8)	$ (516.8)	$ (289.2)
Foreign Currency Gain (Loss) [Member] | Accumulated Other Comprehensive Income, Other [Member]
Other comprehensive income (loss), net of tax	$ (38.0)