Retirement Benefit Plans - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized on the Consolidated Balance Sheets:
Non-current assets	$ 86.3	$ 176.2
Current liabilities	(9.1)	(8.1)
Pension Plan, Defined Benefit [Member]
Amounts recognized on the Consolidated Balance Sheets:
Non-current assets	69.0	176.2
Current liabilities	4.2	4.1
Non-current liabilities	(101.0)	(103.6)
Total	(36.2)	68.5
International Plans [Member]
Amounts recognized on the Consolidated Balance Sheets:
Non-current assets	17.3	0.0
Current liabilities	4.9	4.0
Non-current liabilities	(45.9)	(62.3)
Total	$ (33.5)	$ (66.3)