Other Post-Retirement Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Pension and post-retirement benefits	$ 1,330.6	$ 869.1
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and post-retirement benefits	202.0	177.0
Medical trend rate used to determine the post retirement benefit obligation	7.10%	7.30%
Ultimate medical trend rate used to determine the post retirement benefit obligation	4.50%	4.50%
Unrecognized net prior service credits, before tax	30
Unrecognized net prior service credits, net of tax	20
Unrecognized actuarial losses, before tax	44
Unrecognized actuarial losses, net of tax	29
Future amortization of prior service cost (credit)	3.0
Prior service credits expected to be recognized as accumulated comprehensive income in net periodic pension cost, net of tax	2.0
Actuarial loss expected to be recognized as accumulated comprehensive income in net periodic pension cost, before tax	3
Actuarial loss expected to be recognized as accumulated comprehensive income in net periodic pension cost, net of tax	$ 2