Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss)	$ 169.0	$ 120.0	$ 60.9
Income (loss) from discontinued operations	0.6	3.5	2.4
Income (loss) from continuing operations	168.4	116.5	58.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	168.5	167.6	90.8
Asset impairment	0.0	(1.6)	1.5
Deferred income tax expense (benefit)	4.6	(67.7)	63.9
Stock compensation expense	15.7	8.4	13.4
Changes in assets and liabilities:
Change in receivables	(34.6)	(12.9)	4.5
Change in other current assets	(9.9)	22.5	10.3
Change in deferred charges, net	1.8	1.9	1.3
Change in other assets and liabilities	(35.2)	15.8	(3.6)
Change in payables and other current liabilities	(30.0)	10.5	(32.2)
Net cash provided by operating activities of continuing operations	249.3	261.0	208.4
Net cash used in operating activities of discontinued operations	0.0	0.0	1.6
Net cash provided by operating activities	249.3	261.0	210.0
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(109.2)	(116.7)	(63.8)
Proceeds from Sales of Assets, Investing Activities	0.0	0.1	48.0
Payments to acquire short-term investments	0.0	(7.2)	(175.3)
Proceeds from maturity of short-term investments	0.8	75.9	170.9
Acquisitions, net of cash acquired	0.0	(802.6)	(16.4)
Net cash used in investing activities of continuing operations	(108.4)	(850.5)	(36.6)
Net cash provided by (used in) investing activities of discontinued operations	0.0	0.0	1.0
Net cash provided by (used in) investing activities	(108.4)	(850.5)	(35.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayments of credit facilities and other debt, net	0.0	(344.9)	0.0
Repayments of Long-term Debt	(57.5)	(107.1)	(5.9)
Proceeds from Accounts Receivable Securitization	822.0	514.0	0.0
Repayments of Accounts Receivable Securitization	(802.0)	(474.0)	0.0
Repurchase of common shares	(72.5)	(45.4)	(122.6)
Proceeds from exercise of stock options	3.3	1.5	2.8
Payments of Debt Issuance Costs	0.0	(2.0)	0.0
Payments of Dividends	(29.6)	(26.2)	(23.8)
Excess tax benefit from share-based compensation	1.2	1.9	1.2
Net cash used in financing activities of continuing operations	(135.1)	207.6	(148.3)
Net increase (decrease) in cash and cash equivalents	5.8	(381.9)	26.1
Cash and cash equivalents at beginning of period	198.9	580.8	554.7
Cash and cash equivalents at end of period	204.7	198.9	580.8
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	15.0	16.6	11.2
Income taxes paid, net of refunds	$ 42.8	$ 52.7	$ (5.7)