Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Accrued interest	$ 116.5	$ 96.0
Compensation and benefits	148.2	134.6
Deferred revenue	42.7	58.8
Taxes, other than income	27.7	25.2
Legal accruals	14.9	8.1
Customer advances and licenses	55.0	15.9
Other	104.1	115.6
Total Accrued Liabilities	$ 509.1	$ 454.2