Pensions and Other Post-retirement Benefits (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension plan required minimum contributions, 2014	$ 10.9
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization period for pension plan actuarial gains (losses) (in years)	21 years
Pension plan required minimum contributions, 2014	19.2
Pension plan required minimum contributions, 2015	20.4
Pension plan required minimum contributions, 2016	17.4
Pension plan required minimum contributions, 2017	16.9
Pension plan required minimum contributions, thereafter	49.0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Aggregate expense of other postretirement benefit plans	$ 0.6	$ 0.5