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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ (8.0) |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 746.3 |
Other comprehensive loss, net of tax | (8.3) |
Ending balance | 753.6 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (38.5) | $ (37.1)
Reclassification from AOCI, Current Period, Tax | (0.3) | (0.5)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 1.2 | 0.9
Other comprehensive loss, net of tax | 1.2 | 0.9
Ending balance | (37.3) | (36.2)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0.2 | 0.2
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 1.3 | 1.2
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.9 | 0.8
OCI, before Reclassifications, before Tax, Attributable to Parent | 1.0 | 1.1
Other Comprehensive Income (Loss) before Reclassifications, Tax | (0.2) | (0.4)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.8 | 0.7
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (1.5) | (0.9)
Reclassification from AOCI, Current Period, Tax | 0.5 | 0.3
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (1.0) | (0.6)
Other comprehensive loss, net of tax | (0.2) | 0.1
Ending balance | 0.7 | 0.9
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.5 | (0.2)
OCI, before Reclassifications, before Tax, Attributable to Parent | (12.2) | 0.3
Other Comprehensive Income (Loss) before Reclassifications, Tax | 3.0 | (0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (9.2) | 0.2
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (0.1) | 0.2
Reclassification from AOCI, Current Period, Tax | 0.0 | (0.1)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.1) | 0.1
Other comprehensive loss, net of tax | (9.3) | 0.3
Ending balance | (8.8) | 0.1
Accumulated Other Comprehensive Loss (Other) [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.0 | (0.2)
Other comprehensive loss, net of tax | 0.0 | 0.0
Ending balance | 0.0 | (0.2)
AOCI Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (36.7) |
Other comprehensive loss, net of tax | (8.3) |
Ending balance | $ (45.4) | $ (35.4)

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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