Accumulated Other Comprehensive Income (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense (Benefit)	$ 129.9	$ 90.4	$ 63.1	$ (1.0)	$ 134.1	$ 65.0	$ 24.3	$ 153.5	$ 89.3	$ 283.4	$ 223.4	$ 345.2		$ 222.4		$ 137.2
Net income (loss)												394.0		271.2		218.0
Selling, General and Administrative Expenses [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Defined Benefit Plan, Amortization of Gains (Losses)												14.2	[1]	13.7	[1]	(4.0)	[1]
Income Tax Expense (Benefit)												5.5		4.2		(1.3)
Net income (loss)												8.7		9.5		(2.7)
Other Income | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)												10.0		9.5		(2.7)
Foreign Currency Transaction Gain (Loss), before Tax												$ 1.3	[2]	$ 0	[2]	$ 0	[2]

[1] Included in the computation of net periodic pension / postretirement expenses (see Note 6—Employee Retirement Benefits).

[2] Tax amounts are included in "Provision for taxes on income" in the consolidated statements of operations.