Shareholders' Equity (Schedule Of Accumulated Other Comprehensive Income Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 226.0	$ 384.1	$ 266.4
Other comprehensive income (loss) income before reclassifications, net of tax benefit (expense)	(9.7)	(72.3)
Amounts reclassified from accumulated other comprehensive (loss)	93.1	12.9
Net current period other comprehensive (loss) income	83.4	(59.4)
Balance	364.9	226.0	384.1
ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption		(54.3)
ASU 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption	0.1
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(74.7)	(47.1)
Other comprehensive income (loss) income before reclassifications, net of tax benefit (expense)	3.9	(27.6)
Amounts reclassified from accumulated other comprehensive (loss)	80.2
Net current period other comprehensive (loss) income	84.1	(27.6)
Balance	9.4	(74.7)	(47.1)
Derivative Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	5.3	3.5
Other comprehensive income (loss) income before reclassifications, net of tax benefit (expense)	(15.0)
Amounts reclassified from accumulated other comprehensive (loss)	1.1	1.1
Net current period other comprehensive (loss) income	(13.9)	1.1
Balance	(8.5)	5.3	3.5
Derivative Gain (Loss) [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption		0.7
Derivative Gain (Loss) [Member] | ASU 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption	0.1
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(390.2)	(302.3)
Other comprehensive income (loss) income before reclassifications, net of tax benefit (expense)	1.4	(44.7)
Amounts reclassified from accumulated other comprehensive (loss)	11.8	11.8
Net current period other comprehensive (loss) income	13.2	(32.9)
Balance	(377.0)	(390.2)	(302.3)
Pension And Postretirement Adjustments [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption		(55.0)
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(459.6)	(345.9)	(403.8)
Balance	(376.1)	(459.6)	$ (345.9)
Accumulated Other Comprehensive (Loss) [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption		$ (54.3)
Accumulated Other Comprehensive (Loss) [Member] | ASU 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Impact of ASU adoption	$ 0.1