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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | $ 3,246.3
Ending balance | 3,444.3
Foreign Currency Translation Adjustments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (0.4)
Other comprehensive income before reclassifications, net of tax | 0.0
Amounts reclassified from AOCI, net of tax | 0.0
Ending balance | (0.4)
Unfunded Employee Benefit Obligations |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (144.2)
Other comprehensive income before reclassifications, net of tax | 0.0
Amounts reclassified from AOCI, net of tax | 5.0
Ending balance | (139.2)
Accumulated Other Comprehensive Loss |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (144.5)
Other comprehensive income before reclassifications, net of tax | (0.2)
Amounts reclassified from AOCI, net of tax | 5.0
Ending balance | (139.7)
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (0.2)
Other comprehensive income before reclassifications, net of tax | 0.0
Amounts reclassified from AOCI, net of tax | 0.0
Ending balance | (0.2)
Marketable Debt Securities | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | 0.3
Other comprehensive income before reclassifications, net of tax | (0.2)
Amounts reclassified from AOCI, net of tax | 0.0
Ending balance | $ 0.1

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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