Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes recognized in other comprehensive income (loss):
Total recognized in other comprehensive income	$ 9.2	$ 37.8	$ 22.0
Pension Benefits [Member]
Amounts recognized in other comprehensive income (loss):
Prior service costs	(2.8)	(2.6)
Actuarial loss	(231.2)	(212.0)
Subtotal	(234.0)	(214.6)
Deferred taxes	85.2	78.6
Net amount recognized	(148.8)	(136.0)
Changes recognized in other comprehensive income (loss):
Adjustment to OCI due to reclassification	0.8	0
Current year prior service costs	0	0
Current year actuarial loss	34.0	44.4
Effect of exchange rates	(0.7)	0.4
Amortization of prior service (costs) credits	(0.4)	(0.9)
Amortization of actuarial loss	(15.8)	(8.2)
Total recognized in other comprehensive income	19.3	34.9
Total recognized in net periodic benefit cost and other comprehensive income (loss)	39.8	48.2
Other Benefits [Member]
Amounts recognized in other comprehensive income (loss):
Prior service costs	24.2	12.7
Actuarial loss	(22.2)	(20.8)
Subtotal	2.0	(8.1)
Deferred taxes	(0.8)	3.1
Net amount recognized	1.2	(5.0)
Changes recognized in other comprehensive income (loss):
Adjustment to OCI due to reclassification	0	0
Current year prior service costs	(14.2)	0
Current year actuarial loss	2.8	2.3
Effect of exchange rates	0	0
Amortization of prior service (costs) credits	2.7	1.9
Amortization of actuarial loss	(1.4)	(1.2)
Total recognized in other comprehensive income	(10.1)	3.0
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ (10.8)	$ 4.0