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Business Combinations - Schedule of Unaudited Pro Forma Financial Results (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Revenue	$ 2,644.9us-gaap_BusinessAcquisitionsProFormaRevenue	$ 2,353.5us-gaap_BusinessAcquisitionsProFormaRevenue
Net income (controlling interest)	$ 474.9us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	$ 382.3us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Earnings per share—basic (in dollars per share)	$ 8.63us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ 7.20us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Earnings per share—diluted (in dollars per share)	$ 8.40us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ 6.94us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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