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Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Operating Activities
Net income	$ 53.2	$ 66.0
Adjustments to reconcile net income (loss) to net cash provided (required) by operating activities
Depreciation and amortization	68.2	58.7
Deferred and noncurrent income tax charges (benefits)	(1.4)	(0.5)
Accretion of asset retirement obligations	0.9	0.8	$ 3.2
Amortization of discount on marketable securities	0.0	(0.1)
(Gains) losses from sale of assets	0.3	(0.4)
Net (increase) decrease in noncash operating working capital	0.3	4.2
Other operating activities - net	7.0	7.3
Net cash provided (required) by operating activities	128.5	136.0
Investing Activities
Property additions	(87.8)	(76.2)
Proceeds from sale of assets	0.3	1.0
Redemptions of marketable securities	0.0	1.0
Other investing activities - net	(0.2)	(0.7)
Net cash provided (required) by investing activities	(87.7)	(74.9)
Financing Activities
Purchase of treasury stock	(150.0)	(86.4)
Dividends paid	(9.8)	(8.8)
Borrowings of debt	670.0	0.0
Repayments of debt	(530.0)	(3.9)
Amounts related to share-based compensation	(18.6)	(23.1)
Net cash provided (required) by financing activities	(38.4)	(122.2)
Net increase (decrease) in cash, cash equivalents, and restricted cash	2.4	(61.1)
Cash, cash equivalents, and restricted cash at beginning of period	47.0	117.8	117.8
Cash, cash equivalents, and restricted cash at end of period	$ 49.4	$ 56.7	$ 47.0

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- Definition

Amount of cash (inflow) outflow from investing activities classified as other.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
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- Definition

The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
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-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
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-Paragraph 13
-Subparagraph (c)
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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.6-03(i)(1))
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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation.

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