Equity Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Balance at December 31:	$ (521.0)
Other comprehensive income before reclassifications	(106.1)
Amounts reclassified from accumulated other comprehensive income	40.5
Tax (expense) benefit	(12.0)
Balance at June 30:	(598.6)
Cash flow hedges and marketable securities [Member]
Balance at December 31:	(1.4)
Other comprehensive income before reclassifications	7.5
Amounts reclassified from accumulated other comprehensive income	6.9
Tax (expense) benefit	(0.5)
Balance at June 30:	12.5
Pension and OPEB Adjustments [Member]
Balance at December 31:	(964.2)
Other comprehensive income before reclassifications	15.0
Amounts reclassified from accumulated other comprehensive income	33.6
Tax (expense) benefit	(11.5)
Balance at June 30:	(927.1)
Foreign Currency Gain (Loss) [Member]
Balance at December 31:	444.6
Other comprehensive income before reclassifications	(128.6)
Amounts reclassified from accumulated other comprehensive income	0
Tax (expense) benefit	0
Balance at June 30:	$ 316.0