Nature of Operations and Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	$ (440.2)
Net period other comprehensive (loss) income	(63.3)	$ 26.8	$ 16.8
Balance, ending	(503.3)	(440.2)
Provision for income taxes	161.9	67.4	43.4
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(440.2)	(466.4)	(483.7)
Other comprehensive (loss) income before reclassifications	(73.6)	8.2	3.5
Amounts reclassified from accumulated other comprehensive loss	10.5	18.0	13.8
Net period other comprehensive (loss) income	(63.1)	26.2	17.3
Balance, ending	(503.3)	(440.2)	(466.4)
Provision for income taxes	106.6	117.9	148.2
Defined Benefit Pension and Other Postretirement Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(301.9)	(397.9)	(344.3)
Other comprehensive (loss) income before reclassifications	19.5	78.0	(67.4)
Amounts reclassified from accumulated other comprehensive loss	10.5	18.0	13.8
Net period other comprehensive (loss) income	30.0	96.0	(53.6)
Balance, ending	(271.9)	(301.9)	(397.9)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(138.3)	(68.5)	(139.4)
Other comprehensive (loss) income before reclassifications	(93.1)	(69.8)	70.9
Amounts reclassified from accumulated other comprehensive loss	0.0	0.0	0.0
Net period other comprehensive (loss) income	(93.1)	(69.8)	70.9
Balance, ending	$ (231.4)	$ (138.3)	$ (68.5)