Equity Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Balance at December 31:	$ (166.7)	$ (521.0)
Other comprehensive income before reclassifications	(43.8)	(100.0)
Amounts reclassified from accumulated other comprehensive income	10.0	19.9
Tax (expense) benefit	(2.0)	(6.1)
Balance at June 30:	(202.5)	(607.2)
Cash flow hedges and marketable securities [Member]
Balance at December 31:	0.4	(1.4)
Other comprehensive income before reclassifications	(0.2)	(11.5)
Amounts reclassified from accumulated other comprehensive income	2.1	3.1
Tax (expense) benefit	0.5	(0.2)
Balance at June 30:	2.8	(10.0)
Pension and OPEB Adjustments [Member]
Balance at December 31:	(562.8)	(964.2)
Other comprehensive income before reclassifications	(0.6)	16.3
Amounts reclassified from accumulated other comprehensive income	7.9	16.8
Tax (expense) benefit	(2.5)	(5.9)
Balance at June 30:	(558.0)	(937.0)
Foreign Currency Gain (Loss) [Member]
Balance at December 31:	395.7	444.6
Other comprehensive income before reclassifications	(43.0)	(104.8)
Amounts reclassified from accumulated other comprehensive income	0	0
Tax (expense) benefit	0	0
Balance at June 30:	$ 352.7	$ 339.8