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Long-term Debt - Long-term Debt Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Sep. 11, 2012
Schedule of Outstanding Long-term Debt
Capital lease obligations	$ 271.5	$ 279.3
Total debt and Capital lease obligations	2,577.7	3,016.4
Less: Current portion	(32.3)	(37.1)
Long-term debt, net of current portion	2,545.4	2,979.3
Term Loan Facilities [Member] \| Term Loan Facilities [Member]
Schedule of Outstanding Long-term Debt
Total debt	$ 294.7	$ 421.2
Senior Notes [Member] \| 5.125% Senior Notes Due 2023 [Member]
Schedule of Outstanding Long-term Debt
Debt instrument interest rate (percent)	5.125%	5.125%	5.125%
Total debt	$ 295.9	$ 295.3
Senior Notes [Member] \| 5.75% Senior Notes Due 2024 [Member]
Schedule of Outstanding Long-term Debt
Debt instrument interest rate (percent)	5.75%	5.75%		5.75%
Total debt	$ 1,193.9	$ 1,193.2
Senior Notes [Member] \| 5.75% Senior Notes Due 2025 [Member]
Schedule of Outstanding Long-term Debt
Debt instrument interest rate (percent)	5.75%	5.75%	5.75%
Total debt	$ 344.4	$ 343.9
Senior Subordinated Notes [Member] \| 2.00% Convertible Senior Subordinated Notes due 2043 [Member]
Schedule of Outstanding Long-term Debt
Debt instrument interest rate (percent)	2.00%	2.00%
Total debt	$ 0.0	$ 275.7
Other Notes Payable [Member]
Schedule of Outstanding Long-term Debt
Total debt	82.3	55.8
Revolving Credit Facility [Member]
Schedule of Outstanding Long-term Debt
Total debt	$ 95.0	$ 152.0