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Postretirement Benefits Pretax Activity in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Prior Service Costs (Credits) [Abstract] |  |  |
Amount Recognized as Component of Net Benefit Costs | $ (0.7) | $ (0.7) | $ (1.3)
Net Actuarial Losses [Abstract] |  |  |
Amount Recognized as Component of Net Benefit Costs | $ 111.8 | 73.1 | 103.8
Percentage of Benefit Obligation or Market Value of Assets, Over Which Actuarial Gains and Losses are Subject to Amortization (in Hundredths) | 10.00% |  |
Pension Plans [Member] |  |  |
Prior Service Costs (Credits) [Abstract] |  |  |
Beginning Balance | $ 0.0 | 0.0 |
Amount Recognized as Component of Net Benefit Costs | 0.0 | 0.0 |
Ending Balance | 0.0 | 0.0 | 0.0
Net Actuarial Losses [Abstract] |  |  |
Beginning Balance | 397.1 | 457.8 |
Actuarial (Gains) Losses Arising During the Period | 16.0 | 11.8 |
Amount Recognized as Component of Net Benefit Costs | (111.0) | (72.5) |
Ending Balance | 302.1 | 397.1 | 457.8
Total | 302.1 | 397.1 |
Estimated Pretax Net Actuarial Loss in Accumulated Other Comprehensive Income (Loss) Expected to be Recognized Over the Next Year | 9.9 |  |
Other Postretirement Benefit Plans [Member] |  |  |
Prior Service Costs (Credits) [Abstract] |  |  |
Beginning Balance | (10.2) | (10.9) |
Amount Recognized as Component of Net Benefit Costs | 0.7 | 0.7 |
Ending Balance | (9.5) | (10.2) | (10.9)
Net Actuarial Losses [Abstract] |  |  |
Beginning Balance | 1.0 | 1.9 |
Actuarial (Gains) Losses Arising During the Period | 0.0 | (0.9) |
Amount Recognized as Component of Net Benefit Costs | 0.0 | 0.0 |
Ending Balance | 1.0 | 1.0 | $ 1.9
Total | (8.5) | $ (9.2) |
Estimated Pretax Net Actuarial Loss in Accumulated Other Comprehensive Income (Loss) Expected to be Recognized Over the Next Year | 0.0 |  |
Estimated Pretax Prior Service (Cost) Credit in Accumulated Other Comprehensive Income (Loss) Expected to be Recognized Over the Next Year | $ 0.7 |  |

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- Definition Element represents the percentage of the greater of the benefit obligation or the market value of assets, over which actuarial gains and losses are amortized over the remaining service period of active plan participants and over the average remaining life expectancy of inactive plan participants. + References No definition available. + Details
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- Definition Amount, before 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, before 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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