Accumulated Other Comprehensive Loss (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), Net of Tax [Roll Forward]
Beginning Balance January 1,	$ 866.6
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 0.8
Ending Balance December 31,	892.9	866.6
Amounts reclassified from accumulated other comprehensive loss, tax	(5.0)	(6.6)
Actuarial loss, tax	10.2	0.5
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(12.4)	(4.6)
Other comprehensive (loss) income before reclassifications	4.7	(7.8)
Amounts reclassified from accumulated other comprehensive loss (net of tax $(6.6) and $(8.0))
Actuarial loss, (net of tax $0.5 and $18.0)
Net current-period other comprehensive (loss) income	4.7	(7.8)
Ending Balance December 31,		(12.4)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(227.9)	(245.5)
Other comprehensive (loss) income before reclassifications
Amounts reclassified from accumulated other comprehensive loss (net of tax $(6.6) and $(8.0))	14.4	19.1
Actuarial loss, (net of tax $0.5 and $18.0)	(29.4)	(1.5)
Net current-period other comprehensive (loss) income	(15.0)	17.6
Ending Balance December 31,		(227.9)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(240.3)	(250.1)
Other comprehensive (loss) income before reclassifications	4.7	(7.8)
Amounts reclassified from accumulated other comprehensive loss (net of tax $(6.6) and $(8.0))	14.4	19.1
Actuarial loss, (net of tax $0.5 and $18.0)	(29.4)	(1.5)
Net current-period other comprehensive (loss) income	$ (10.3)	9.8
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (43.5)
Ending Balance December 31,		$ (240.3)

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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