Employee Benefit Obligations (Details 5) - U.S. - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of the U.S. Level 3 assets:
Fair value of plan assets at the beginning of the period	$ 1,098.0	$ 1,109.5
Fair value of plan assets at the end of the period	987.6	1,098.0
Level 3
Reconciliation of the U.S. Level 3 assets:
Fair value of plan assets at the beginning of the period	63.0	51.9
Actual return on plan assets relating to assets still held at the reporting date	3.3	9.5
Purchases	7.9	9.1
Sales	(11.5)	(7.5)
Fair value of plan assets at the end of the period	$ 62.7	$ 63.0