Pension and Savings Plans (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 years	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Estimated prior service cost that will be amortized from accumulated other comprehensive (income) loss		$ 1.4	$ (20.1)	$ (0.9)
Defined Contribution Plans [Abstract]
Number of 401(k) plans		3
Paid discretionary contributions to defined contribution pension plans, company match		46.4	51.1	54.5
Additional discretionary contributions to defined contribution pension plans, performance feature		16.5	22.5	20.0
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gains and losses amortization corridor, percentage		(5.00%)
Period of amortization (in years)		5
Estimated net actuarial loss that will be amortized from accumulated other comprehensive (income) loss	30.2
Estimated prior service cost that will be amortized from accumulated other comprehensive (income) loss	1.3
Expected rate of return on plan assets	6.85%	7.75%	8.00%	8.25%
Accumulated benefit obligation for pension plans		947.3	1,058.6
Minimum funded percentage defined by the Pension Protection Act of 2006		80.00%
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 13.0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for assets of Master Trust in equity securities		35.00%	55.00%
Fixed Income Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for assets of Master Trust in equity securities		65.00%	45.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for assets of Master Trust in equity securities			4.00%