Goodwill and Other Intangible Assets (Schedule of Expected Amortization) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived intangible assets, amortization expense, next twelve months	$ 16.4
Finite-lived intangible assets, amortization expense, year two	11.8
Finite-lived intangible assets, amortization expense, year three	9.0
Finite-lived intangible assets, amortization expense, year four	6.9
Finite-lived intangible assets, amortization expense, year five	5.3
Finite-lived intangible assets, amortization expense, after year five	21.5
Amortizing intangible assets, net	$ 70.9	[1]	$ 44.5	[1]	$ 36.0

[1] Consists principally of customer relationships, backlog, trade names and non-compete agreements with finite lives.