XML 117 R101.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Components of net deferred tax assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income taxes    
Balance carryforwards, gross value $ 304.4 $ 899.6
Deferred tax assets, future tax benefits 303.9 430.4
Valuation allowance (15.7) (15.0)
Charitable contribution    
Income taxes    
Charitable contribution   9.4
Deferred tax asset, charitable contribution   4.0
Valuation allowance   (1.5)
Charitable contribution and capital loss    
Income taxes    
Charitable contributions and capital loss, gross value 21.7  
Deferred tax assets, charitable contributions and capital loss 8.6  
Valuation allowance (2.1)  
Domestic tax authority    
Income taxes    
Tax credit carryforward, amount 0.0 0.0
Operating loss carryforwards, gross value   407.6
Deferred tax assets, operating loss carryforwards, domestic   142.7
Deferred tax assets, tax credit carryforwards 259.6 241.1
Tax credit carryforward, valuation allowance (0.1) 0.0
Operating loss carryforwards, valuation allowance   0.0
Foreign tax authority    
Income taxes    
Tax credit carryforward, amount 0.0 0.0
Deferred tax asset, federal foreign tax credit 13.5 13.5
Tax credit carryforward, valuation allowance (13.5) (13.5)
State and local jurisdiction    
Income taxes    
Tax credit carryforward, amount 0.0 0.0
Operating loss carryforwards, gross value 282.7 482.6
Deferred tax assets, tax credit carryforwards 5.0 4.8
Deferred tax asset, state net operating loss 17.2 24.3
Tax credit carryforward, valuation allowance 0.0 0.0
Operating loss carryforwards, valuation allowance $ 0.0 $ 0.0