Employee Benefit Obligations - Weighted Average Assumptions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Weighted-average assumptions used to determine net periodic benefit cost
Market related value of plan assets used to calculate expected return	$ 6,068.0	$ 1,395.0	$ 1,471.0
Corridor percentage considered for amortization of accumulated actuarial gains and losses	10.00%
Defined Benefit Pension Plans
Weighted-average assumptions used to determine benefit obligations
Effect of one quarter of a percentage point reduction in the expected return on pension assets assumption, on pension expense	$ 15.0
Effect of quarter of a percentage point reduction in the discount rate applied to the pension liability, on pension expense	$ 2.0
Weighted-average assumptions used to determine net periodic benefit cost
Corridor percentage considered for amortization of accumulated actuarial gains and losses	10.00%
U.S.
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	4.26%	4.60%	4.15%
Rate of compensation increase (as a percent)	4.14%	4.80%	4.80%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	4.60%	4.15%	5.00%
Rate of compensation increase (as a percent)	4.98%	4.80%	4.80%
Expected long-term rate of return on assets (as a percent)	6.88%	7.25%	7.25%
Canada.
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.50%	3.50%	3.50%
Rate of compensation increase (as a percent)		3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	3.50%	3.50%	4.25%
Rate of compensation increase (as a percent)		3.00%	3.00%
Expected long-term rate of return on assets (as a percent)	4.00%	4.00%	4.56%
United Kingdom.
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	2.70%	3.75%	3.75%
Rate of compensation increase (as a percent)	4.30%	3.00%	3.00%
Pension increase (as a percent)	3.30%	3.15%	3.15%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	2.90%	3.75%	4.50%
Rate of compensation increase (as a percent)	3.80%	3.00%	4.25%
Pension increase (as a percent)	2.80%	3.15%	3.40%
Expected long-term rate of return on assets (as a percent)	3.40%	6.50%	6.50%
German Plans
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	1.54%	2.25%	1.75%
Rate of compensation increase (as a percent)	2.50%	2.50%	2.50%
Pension increase (as a percent)	1.50%	1.75%	1.75%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	1.29%	1.75%	3.25%
Rate of compensation increase (as a percent)	2.00%	2.50%	2.75%
Pension increase (as a percent)	1.50%	1.75%	1.75%