Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefit — beginning of year	$ 191.2us-gaap_UnrecognizedTaxBenefits	$ 174.7us-gaap_UnrecognizedTaxBenefits	$ 132.4us-gaap_UnrecognizedTaxBenefits	$ 162.9us-gaap_UnrecognizedTaxBenefits
Additions for current year tax positions	21.9	4.1	5.7
Additions for prior year tax positions	6.3	5.3	0
Reductions for prior year tax positions	(5.1)	0	(5.8)
Settlements	(1.5)	(0.4)	(0.8)
Reductions due to expirations of statute of limitations	(5.1)	(11.8)	(29.6)
Addition due to acquisition	0	45.1	0
Unrecognized tax benefit — end of year	$ 191.2us-gaap_UnrecognizedTaxBenefits	$ 174.7us-gaap_UnrecognizedTaxBenefits	$ 132.4us-gaap_UnrecognizedTaxBenefits	$ 162.9us-gaap_UnrecognizedTaxBenefits

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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