Income Taxes Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Loss and credit carryforwards	$ 91.8	$ 104.7
Pension and employee benefits	37.7	44.7
Restructuring charges	0.3	1.3
Deferred revenue	3.2	2.9
Foreign currency hedge	16.2	11.4
Intercompany payables/receivables	62.0	48.3
Other	42.4	47.9
Valuation allowances	(36.2)	(39.3)
Total deferred tax asset	217.4	221.9
Deferred tax liabilities:
Depreciation and amortization	277.4	291.4
Deferred implementation costs	0.1	0.6
Contingent debt and accrued interest	77.9	67.7
Deferred Tax Liabilities, Undistributed Foreign Earnings	15.8	15.7
Other	7.6	7.3
Total deferred tax liability	378.8	382.7
Net deferred tax (liability) / asset	(161.4)	(160.8)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	14.6	15.0
Deferred Tax Liabilities, Net, Noncurrent	$ 176.0	$ 175.8