Share-Based Compensation Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Expense [Line Items]
Share-based compensation expense	$ 35.6	$ 34.7	$ 22.1
Stock Options [Member]
Share-based Compensation Expense [Line Items]
Share-based compensation expense	2.3	2.9	3.3
Restricted Share Awards [Member]
Share-based Compensation Expense [Line Items]
Share-based compensation expense	23.7	25.6	18.1
Performance Share Units [Member]
Share-based Compensation Expense [Line Items]
Share-based compensation expense	9.4	6.2	0.7
Restricted Share Units (RSUs) [Member]
Share-based Compensation Expense [Line Items]
Share-based compensation expense	$ 0.2	$ 0.0	0.0
Discontinued Operations [Member]
Share-based Compensation Expense [Line Items]
Share-based compensation expense			$ 5.8