Change in Financial Statement due to adoption of Policy (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Item Effected [Line Items]
Long-term debt	$ 3,118.2	$ 3,380.6
Other assets	154.6	140.4
Current portion of long-term debt	299.9
As Previously Reported [Member]
Item Effected [Line Items]
Long-term debt		3,401.0
Other assets		160.8
Reclassification [Member]
Item Effected [Line Items]
Long-term debt	18.5	(20.4)
Other assets	18.6	$ (20.4)
Current portion of long-term debt	0.1
Previous Accounting Guidance [Member]
Item Effected [Line Items]
Long-term debt	3,136.7
Other assets	173.2
Current portion of long-term debt	$ 300.0