Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Accounting Standards Not Yet Implemented (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Deferred Financing Costs [Line Items]
Other current assets	$ 335.4	$ 447.6
Investments and other assets	619.2	363.7
Total assets	12,065.2	10,946.9
Current portion of long-term debt	482.3	5,874.9
Long-term debt, less current portion	0.0	366.3
Total liabilities	$ 11,444.7	10,028.4
Adoption of New Accounting Pronouncement [Member]
Deferred Financing Costs [Line Items]
Other current assets		(55.5)
Investments and other assets		(18.9)
Total assets		(74.4)
Current portion of long-term debt		(55.5)
Long-term debt, less current portion		(18.9)
Total liabilities		(74.4)
Before Adoption [Member]
Deferred Financing Costs [Line Items]
Other current assets		503.1
Investments and other assets		382.6
Total assets		11,021.3
Current portion of long-term debt		5,930.4
Long-term debt, less current portion		385.2
Total liabilities		$ 10,102.8