Income Taxes (ASC 740-10) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Mar. 31, 2014
Income Tax Contingency [Line Items]
Percentage of likelihood for realization of benefit upon ultimate settlement			50.00%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	$ 46.6		$ 65.5		$ 95.8
Changes in prior year tax positions	(4.8)		1.9		1.2
Tax positions taken during the current year	8.6
Lapse in statute of limitations					(10.5)
Settlements with tax authorities	(0.4)		(0.6)		(0.6)
Tax positions taken during the current year			(20.2)		(20.4)
Balance at year end	50.0		46.6		65.5
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense	27.5						5.0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	5.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1.3		1.2		0.6
Permanent Differences [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	9.7	[1]	9.6	[1]	14.5	[1]
Changes in prior year tax positions	0.6	[1]	0.5	[1]	(0.9)	[1]
Tax positions taken during the current year	7.9	[1]
Lapse in statute of limitations					(3.4)	[1]
Settlements with tax authorities	0	[1]	(0.4)	[1]	(0.6)	[1]
Tax positions taken during the current year			0	[1]	0	[1]
Balance at year end	18.2	[1]	9.7	[1]	9.6	[1]
Temporary Differences [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	28.9	[2]	49.1	[2]	75.1	[2]
Changes in prior year tax positions	(7.1)	[2]	0	[2]	0.1	[2]
Tax positions taken during the current year	0.7	[2]
Lapse in statute of limitations					(5.7)	[2]
Settlements with tax authorities	0	[2]	0	[2]	0	[2]
Tax positions taken during the current year			(20.2)	[2]	(20.4)	[2]
Balance at year end	22.5	[2]	28.9	[2]	49.1	[2]
Interest and Penalties Net of Tax Benefit [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	8.0	[3]	6.8	[3]	6.2	[3]
Changes in prior year tax positions	1.7	[3]	1.4	[3]	2.0	[3]
Tax positions taken during the current year	0	[3]
Lapse in statute of limitations					(1.4)	[3]
Settlements with tax authorities	(0.4)	[3]	(0.2)	[3]	0	[3]
Tax positions taken during the current year			0	[3]	0	[3]
Balance at year end	$ 9.3	[3]	$ 8.0	[3]	$ 6.8	[3]

[1] Represents the amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate.

[2] Represents the amount of unrecognized tax benefits that, if recognized would create a temporary difference between the reported amount of an item in the Company’s Consolidated Balance Sheet and its tax basis.

[3] Net of tax benefit.