Comprehensive Income (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	$ (22.3)
Other comprehensive income/(loss) before reclassifications	(7.8)
Amounts reclassified from AOCI	(41.5)
Net other comprehensive income/(loss)	(49.3)
Balance as of March 31, 2013	(71.6)
Gains / (Losses) on Cash Flow Hedges [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	1.1
Other comprehensive income/(loss) before reclassifications	(3.0)
Amounts reclassified from AOCI	(0.4)
Net other comprehensive income/(loss)	(3.4)
Balance as of March 31, 2013	(2.3)
Unrealized Gains / (Losses) on Available-for-Sale Securities [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	9.3
Other comprehensive income/(loss) before reclassifications	(1.5)
Amounts reclassified from AOCI	0
Net other comprehensive income/(loss)	(1.5)
Balance as of March 31, 2013	7.8
Defined Benefit Pension Plan Items [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	(147.5)
Other comprehensive income/(loss) before reclassifications	0.7
Amounts reclassified from AOCI	0
Net other comprehensive income/(loss)	0.7
Balance as of March 31, 2013	(146.8)
Foreign Currency Translation Adjustments [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	114.8
Other comprehensive income/(loss) before reclassifications	(4.0)
Amounts reclassified from AOCI	(41.1)
Net other comprehensive income/(loss)	(45.1)
Balance as of March 31, 2013	$ 69.7