Pension and Other Post-Retirement Plans - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2013 Defined benefit pension plans	Dec. 31, 2012 Defined benefit pension plans	Sep. 30, 2012 U.K. Plan	Dec. 31, 2013 Canadian Plan	Dec. 31, 2013 Global return fund U.K. Plan	Dec. 31, 2013 Long lease property U.K. Plan	Dec. 31, 2013 Corporate bonds U.K. Plan	Dec. 31, 2012 Real estate U.K. Plan	Dec. 31, 2013 U.K Equity securities U.K. Plan	Dec. 31, 2013 Canada Equity securities Canadian Plan	Dec. 31, 2013 Other foreign countries Equity securities U.K. Plan	Dec. 31, 2013 Other foreign countries Equity securities Canadian Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated contributions in the next fiscal year	$ 2.1
Accumulated benefit obligation	112.4	102.1
Underfunded status of plan	10.0	17.9
Decrease in benefit obligation due to plan amendment			$ 5.8
Maximum increase in pensionable earnings			2.00%
Funded percentage (less than 100%)			100.00%
Target allocations of plan assets
Target allocation in debt securities (as a percent)				40.00%	35.00%	15.00%	10.00%	5.00%	20.00%	20.00%	15.00%	40.00%