Business Combinations Business Combinations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		12 Months Ended						3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2013 Australian Dollars [Member]	Dec. 31, 2013 United States of America, Dollars [Member]	Dec. 31, 2013 Customer Relationships [Member]	Mar. 03, 2014 2014 Term Loan [Member]	Mar. 03, 2014 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Convertible Debt [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		0.7
Payments to Acquire Businesses, Net of Cash Acquired		$ 804.5	$ 0	$ 15.0	$ 20.0	$ 20.0
Repayments of Assumed Debt				5.3
Goodwill, Acquired During Period				12.2
Business Acquisition, Customer Relationship Intangible Assets Acquired				7.0
Acquired Finite-Lived Intangible Asset, Useful Life							8 years
Line of Credit Facility, Maximum Borrowing Capacity								350.0	300.0
Senior Notes	230.0	230.0		0
Interest Payable, Current	13.0	13.0
Repayments of Convertible Debt										16.1
Interest Paid										3.2	0.3
Repayments of Lines of Credit											63.1
Business Acquisition, Transaction Costs	14.7	14.7
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	85.6
Business Acquisition, Effective Date of Acquisition		Mar. 03, 2014
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	$ (6.4)