Employee Benefit Obligations (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted-average assumptions used to determine net periodic benefit cost for years ended
Market related value of plan assets used to calculate expected return	$ 1,395.3	$ 1,470.9	$ 1,238.5
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	$ 3.4
Effect of quarter of a percentage point reduction in the discount rate applied to the pension liability, on pension expense	$ 4.8
Weighted-average assumptions used to determine net periodic benefit cost for years ended
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)	4.60%	4.15%	5.00%
Rate of compensation increase (as a percent)	4.80%	4.80%	4.80%
Weighted-average assumptions used to determine net periodic benefit cost for years ended
Discount rate (as a percent)	4.15%	5.00%	4.13%
Rate of compensation increase (as a percent)	4.80%	4.80%	4.80%
Expected long-term rate of return on assets (as a percent)	7.25%	7.25%	7.63%
Canada.
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.50%	3.50%	4.25%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost for years ended
Discount rate (as a percent)	3.50%	4.25%	4.00%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Expected long-term rate of return on assets (as a percent)	4.00%	4.56%	4.55%
Time period for review of the expected benefit payments to select discount rate	60 years
United Kingdom.
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.75%	3.75%	4.50%
Rate of compensation increase (as a percent)	3.00%	3.00%	4.25%
Pension increase (as a percent)	3.15%	3.15%	3.40%
Weighted-average assumptions used to determine net periodic benefit cost for years ended
Discount rate (as a percent)	3.75%	4.50%	4.50%
Rate of compensation increase (as a percent)	3.00%	4.25%	3.75%
Pension increase (as a percent)	3.15%	3.40%	2.90%
Expected long-term rate of return on assets (as a percent)	6.50%	6.50%	7.00%
Minimum term of bond used to discount cash flows for determining equivalent level discount rate	15 years
Germany.
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	2.25%	1.75%	3.25%
Rate of compensation increase (as a percent)	2.50%	2.50%	2.75%
Pension increase (as a percent)	1.75%	1.75%	1.75%
Weighted-average assumptions used to determine net periodic benefit cost for years ended
Discount rate (as a percent)	1.75%	3.25%	3.25%
Rate of compensation increase (as a percent)	2.50%	2.75%	2.75%
Pension increase (as a percent)	1.75%	1.75%	1.75%
Minimum term of bond used to discount cash flows for determining equivalent level discount rate	15 years