Nature of Operations and Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	$ (466.4)
Net period other comprehensive (loss) income	26.8	$ 16.8	$ (36.2)
Balance, ending	(440.2)	(466.4)
Provision for income taxes	82.9	38.6	31.3
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(466.4)	(483.7)	(447.6)
Other comprehensive (loss) income before reclassifications	8.2	3.5	(46.8)
Amounts reclassified from accumulated other comprehensive loss	18.0	13.8	10.7
Net period other comprehensive (loss) income	26.2	17.3	(36.1)
Balance, ending	(440.2)	(466.4)	(483.7)
Provision for income taxes	117.9	148.2	135.4
Defined Benefit Pension and Other Postretirement Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(397.9)	(344.3)	(296.6)
Other comprehensive (loss) income before reclassifications	78.0	(67.4)	(58.4)
Amounts reclassified from accumulated other comprehensive loss	18.0	13.8	10.7
Net period other comprehensive (loss) income	96.0	(53.6)	(47.7)
Balance, ending	(301.9)	(397.9)	(344.3)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(68.5)	(139.4)	(151.0)
Other comprehensive (loss) income before reclassifications	(69.8)	70.9	11.6
Amounts reclassified from accumulated other comprehensive loss	0.0	0.0	0.0
Net period other comprehensive (loss) income	(69.8)	70.9	11.6
Balance, ending	$ (138.3)	$ (68.5)	$ (139.4)