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Income Taxes Components of net deferred tax assets (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income taxes |  |
Balance carryforwards, gross value | $ 899.6 | $ 602.9
Deferred tax assets, future tax benefits | 430.4 | 382.8
Deferred Tax Assets, Valuation Allowance | 15.0 | 17.1
Charitable contribution |  |
Income taxes |  |
Charitable contributions, gross value | 9.4 | 4.7
Deferred tax asset, charitable contribution | 4.0 | 1.9
Deferred Tax Assets, Valuation Allowance | 1.5 | 1.9
Domestic tax authority |  |
Income taxes |  |
Operating loss carryforwards, gross value | 407.6 | 412.3
Tax credit carryforward, amount | 0.0 | 0.0
Deferred tax assets, federal net operating loss | 142.7 | 144.3
Deferred tax assets, tax credit carryforwards | 241.1 | 207.8
Operating loss carryforwards, valuation allowance | 0.0 | 0.0
Tax credit carryforward, valuation allowance | 0.0 | 0.0
Foreign tax authority |  |
Income taxes |  |
Tax credit carryforward, amount | 0.0 | 0.0
Deferred tax asset, federal foreign tax credit | 13.5 | 15.2
Tax credit carryforward, valuation allowance | 13.5 | 15.2
State and local jurisdiction |  |
Income taxes |  |
Operating loss carryforwards, gross value | 482.6 | 185.9
Tax credit carryforward, amount | 0.0 | 0.0
Deferred tax assets, tax credit carryforwards | 4.8 | 4.3
Deferred tax asset, state net operating loss | 24.3 | 9.3
Operating loss carryforwards, valuation allowance | 0.0 | 0.0
Tax credit carryforward, valuation allowance | $ 0.0 | $ 0.0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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