Employee Retirement Plans and Postretirement Benefits Changes Recognized Pre-tax (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income), at the beginning of the period	$ 788.6	$ 1,121.0
Amortization of prior service costs (benefit)	2.4	2.8
Amortization of net actuarial loss (gain)	(35.4)	(56.5)
Current year actuarial loss (gain)	172.3	(278.0)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		(0.1)
Plan amendment	0	0.4
Foreign currency exchange rate change	(8.4)	(0.6)
Accumulated other comprehensive loss (income), at the end of the period	919.5	788.6
Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income), at the beginning of the period	814.2	1,134.3
Amortization of prior service costs (benefit)	(0.6)	(0.8)
Amortization of net actuarial loss (gain)	(36.3)	(56.6)
Current year actuarial loss (gain)	159.7	(262.3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		0
Plan amendment	0	0.5
Foreign currency exchange rate change	(10.0)	(0.4)
Accumulated other comprehensive loss (income), at the end of the period	927.0	814.2
OPEB
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income), at the beginning of the period	(25.6)	(13.3)
Amortization of prior service costs (benefit)	3.0	3.6
Amortization of net actuarial loss (gain)	0.9	0.1
Current year actuarial loss (gain)	12.6	(15.7)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		(0.1)
Plan amendment	0	(0.1)
Foreign currency exchange rate change	1.6	(0.2)
Accumulated other comprehensive loss (income), at the end of the period	$ (7.5)	$ (25.6)