Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Oct. 31, 2016
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	$ 212.2	$ 199.2
Current liabilities - taxes accrued	66.7	68.4
Deferred credits and other liabilities	1,756.1	1,740.0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	138.6	126.3
Current liabilities - taxes accrued	(1.4)	(1.1)
Deferred credits and other liabilities	3.9	3.7
Total liabilities	2.5	2.6
Net assets	$ 136.1	$ 123.7