Financial Information for Subsidiary and Guarantor Parent (Cash Flow) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Statement of Cash Flows
Cash flows provided by (used in) operating activities	$ 227.4	$ 245.8
Investing Activities:
Purchases of property, plant and equipment	(395.5)	(245.6)
Net receipts/(payments) on intercompany activity	0	0
Asset disposals and other	0.8	1.5
Cash used in investing activities	(394.7)	(244.1)
Financing Activities:
Borrowings on long-term debt	500.0	0
Net receipts/(payments) on intercompany activity	0	0
Dividends paid to stockholders	(57.7)	(57.3)
Other	(43.9)	(44.0)
Cash provided by (used in) financing activities	398.4	(101.3)
Increase (decrease) in cash and cash equivalents	231.1	(99.6)
Parent Company
Statement of Cash Flows
Cash flows provided by (used in) operating activities	(9.1)	(26.1)
Investing Activities:
Purchases of property, plant and equipment	(0.2)	(1.0)
Net receipts/(payments) on intercompany activity	0	0
Asset disposals and other	0.1	0
Cash used in investing activities	(0.1)	(1.0)
Financing Activities:
Borrowings on long-term debt	500.0
Net receipts/(payments) on intercompany activity	(409.0)	103.8
Dividends paid to stockholders	(57.7)	(57.3)
Other	(27.0)	(17.0)
Cash provided by (used in) financing activities	6.3	29.5
Increase (decrease) in cash and cash equivalents	(2.9)	2.4
Subsidiaries
Statement of Cash Flows
Cash flows provided by (used in) operating activities	(87.2)	4.1
Investing Activities:
Purchases of property, plant and equipment	(359.1)	(192.5)
Net receipts/(payments) on intercompany activity	0	0
Asset disposals and other	0.1	0.2
Cash used in investing activities	(359.0)	(192.3)
Financing Activities:
Borrowings on long-term debt	0
Net receipts/(payments) on intercompany activity	440.4	83.2
Dividends paid to stockholders	0	0
Other	0	(0.1)
Cash provided by (used in) financing activities	440.4	83.1
Increase (decrease) in cash and cash equivalents	(5.8)	(105.1)
NonGuarantor Subsidiaries
Statement of Cash Flows
Cash flows provided by (used in) operating activities	348.0	267.8
Investing Activities:
Purchases of property, plant and equipment	(36.2)	(52.1)
Net receipts/(payments) on intercompany activity	(31.4)	(187.0)
Asset disposals and other	0.6	1.3
Cash used in investing activities	(67.0)	(237.8)
Financing Activities:
Borrowings on long-term debt	0
Net receipts/(payments) on intercompany activity	0	0
Dividends paid to stockholders	(24.3)	0
Other	(16.9)	(26.9)
Cash provided by (used in) financing activities	(41.2)	(26.9)
Increase (decrease) in cash and cash equivalents	239.8	3.1
Consolidation Eliminations
Statement of Cash Flows
Cash flows provided by (used in) operating activities	(24.3)	0
Investing Activities:
Purchases of property, plant and equipment	0	0
Net receipts/(payments) on intercompany activity	31.4	187.0
Asset disposals and other	0	0
Cash used in investing activities	31.4	187.0
Financing Activities:
Borrowings on long-term debt	0
Net receipts/(payments) on intercompany activity	(31.4)	(187.0)
Dividends paid to stockholders	24.3	0
Other	0	0
Cash provided by (used in) financing activities	(7.1)	(187.0)
Increase (decrease) in cash and cash equivalents	$ 0	$ 0