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Benefit Plans, Amounts Recognized in Accumulated Other Comprehensive Income, net of Related Tax Effects (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Amounts recognized in accumulated other comprehensive income [Abstract] |  |
Amount recognized end of year | $ 96.1 | $ 69.7
Accumulated benefit obligation | 450.5 | 389.9
Pension Benefits [Member] |  |
Amounts recognized in accumulated other comprehensive income [Abstract] |  |
Net actuarial (gain) loss | 99.6 | 73.5
Prior service cost | 0.1 | 0.1
Amount recognized end of year | 99.7 | 73.6
Post-Retirement Benefits [Member] |  |
Amounts recognized in accumulated other comprehensive income [Abstract] |  |
Net actuarial (gain) loss | (3.7) | (4.1)
Prior service cost | 0.0 | 0.0
Amount recognized end of year | $ (3.7) | $ (4.1)

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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