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Income Taxes - Components of net deferred tax assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income taxes    
Balance carryforwards, gross value $ 275.9 $ 304.4
Deferred tax assets, future tax benefits 70.6 303.9
Valuation allowance (11.4) (15.7)
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)
Foreign tax authority    
Income taxes    
Tax credit carryforward, amount 0.0 0.0
Deferred tax asset, federal foreign tax credit 9.7 13.5
Tax credit carryforward, valuation allowance (9.7) (13.5)
Domestic tax authority    
Income taxes    
Tax credit carryforward, amount 0.0 0.0
Deferred tax assets, tax credit carryforwards 39.3 259.6
Tax credit carryforward, valuation allowance (1.7) (0.1)
State and local jurisdiction    
Income taxes    
Tax credit carryforward, amount 0.0 0.0
Operating loss carryforwards, gross value 275.9 282.7
Deferred tax assets, tax credit carryforwards 4.6 5.0
Deferred tax asset, state net operating loss 17.0 17.2
Tax credit carryforward, valuation allowance 0.0 0.0
Operating loss carryforwards, valuation allowance $ 0.0 $ 0.0