Income Taxes (ASC 740-10) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	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	$ 50.0	$ 46.6	$ 65.5
Changes in prior year tax positions	(4.8)	(4.8)	1.9
Tax positions taken during the current year	13.7
Lapse in statute of limitations	(1.1)		0
Settlements with tax authorities	(0.9)	(0.4)	(0.6)
Tax positions taken during the current year		8.6	(20.2)
Balance at year end	56.9	50.0	46.6
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense	27.1			5.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(2.6)	1.3	1.2
Permanent Differences [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	18.2	9.7	9.6
Changes in prior year tax positions	(2.0)	0.6	0.5
Tax positions taken during the current year	5.6
Lapse in statute of limitations	(0.8)		0
Settlements with tax authorities	(0.6)	0	(0.4)
Tax positions taken during the current year		7.9	0
Balance at year end	20.4	18.2	9.7
Temporary Differences [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	22.5	28.9	49.1
Changes in prior year tax positions	(0.8)	(7.1)	0
Tax positions taken during the current year	8.1
Lapse in statute of limitations	0		0
Settlements with tax authorities	0	0	0
Tax positions taken during the current year		0.7	(20.2)
Balance at year end	29.8	22.5	28.9
Interest and Penalties Net of Tax Benefit [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	9.3	8.0	6.8
Changes in prior year tax positions	(2.0)	1.7	1.4
Tax positions taken during the current year	0
Lapse in statute of limitations	(0.3)		0
Settlements with tax authorities	(0.3)	(0.4)	(0.2)
Tax positions taken during the current year		0	0
Balance at year end	$ 6.7	$ 9.3	$ 8.0