Fair Value Measurements, Assets and Liabilities (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash equivalents	$ 617.3	$ 4,859.9
Bank time deposits	8.5
Investments in mutual funds, unit trusts and other similar instruments	8.7	9.8
Insurance contracts	102.5	74.5
Auction rate securities		4.5
Derivative contracts	20.2	3.8
Total Assets	757.2	4,952.5
Liabilities
Derivative contracts	10.4	6.5
Contingent consideration	29.6	5.1
Total Liabilities	40.0	11.6
Quoted Prices in Active Markets (Level I) [Member]
Assets
Cash equivalents	617.3	4,859.9
Bank time deposits	8.5
Investments in mutual funds, unit trusts and other similar instruments	8.7	9.8
Total Assets	634.5	4,869.7
Significant Other Observable Inputs (Level 2) [Member]
Assets
Insurance contracts	102.5	74.5
Derivative contracts	20.2	3.8
Total Assets	122.7	78.3
Liabilities
Derivative contracts	10.4	6.5
Total Liabilities	10.4	6.5
Significant Unobservable Inputs (Level 3) [Member]
Assets
Auction rate securities		4.5
Total Assets		4.5
Liabilities
Contingent consideration	29.6	5.1
Total Liabilities	$ 29.6	$ 5.1