Pension Plans and Other Postretirement Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,953.9	$ 2,698.2
Service cost	22.8	29.4	$ 39.0
Interest cost	121.0	133.6	122.8
Benefits paid	(207.4)	(269.9)
Subsidy paid	0.0	0.0
Participant contributions	0.3	0.3
Effect of currency rates	(4.8)	(4.9)
Net actuarial (gains) losses - discount rate change	(124.4)	288.5
Net actuarial (gains) losses - other	44.5	78.4
Plan curtailments	0.0	0.0
Plan settlements	0.0	0.0
Special termination benefits	0.0	0.3
Benefit obligation at end of year	2,805.9	2,953.9	2,698.2
Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	466.1	506.7
Service cost	2.7	2.9	3.2
Interest cost	17.9	24.0	22.4
Benefits paid	(53.4)	(54.3)
Subsidy paid	0.7	1.0
Participant contributions	0.0	0.0
Effect of currency rates	0.0	0.0
Net actuarial (gains) losses - discount rate change	(14.1)	39.5
Net actuarial (gains) losses - other	(19.1)	(19.5)
Plan curtailments	0.0	(7.2)
Plan settlements	0.0	(27.0)
Special termination benefits	0.0	0.0
Benefit obligation at end of year	$ 400.8	$ 466.1	$ 506.7